13 best diamond tip drill bit for metal

• 5 pieces multipurpose drill bits with 6-inch length in the set: 5/32, 3/16, 1/4, 5/16, 3/8 inch
• Robust high-quality tungsten carbide head provides longer life in multi-materials including brick, block, tile, fiber cement, wood, plastic and metal
• Multi-grind sharp edges deliver high drilling speed even in hard materials, perform 85% faster in multi material than standard bits
• Big "U" flute design cleans debris out fast which make it a efficient metal and wood drill bits set
• Hex shank allows using in impactors and hammer drill/drivers for outstanding bit grip

User questions & answers

Question:	will these work on stainless steel
Answer:	Yes, this drill bit can cut through stainless for sure. From our internal test, it drill through 2mm thickness 18/8 stainless steel very fast.
Question:	Can you use these drill bits on all kinds of drills
Answer:	They will work on most drills.
Question:	Are these made on the USA
Answer:	All the bits are made in China, Bosch supplier with professional drill bit technology, outstanding performance!
Question:	What is the exact length of the longest bit in the set
Answer:	All the hex drill bits in the set have the same length of 6-inch.

Product description

★【2 / Pack】

✔ Drill Size: 5/32 inch

✔ Flute Length: 1-3/8 inch 

✔ Overall Length: 2-1/2 inch

⚠【IMPORTANT, PLEASE READ BEFORE YOU BUY】⚠

① Tungsten carbide or cemented carbide is a composite material, although it looks like a metal, it is a composite of Tungsten carbide powder mixed with cobalt as a binder metal and the resulting material is more like a ceramic than a metal. 

② It is a very hard material being a 9 on the Mohs scale where diamond is a 10, quartz a 7 and hard steel around 4.5. Due to its hardness, it will chew down into most anything But that hardness makes them brittle on side load with virtually no plastic deformation before failure. 

③ Any movement while drilling can result in a broken bit. These drills like a rigid drilling setup like a drill press or a machining center, they do not like hand drills. 

④ You can use them in a hand held drill but you have to make sure not to misalign the drill, the drill must be perfectly square for the whole operation.

Mars-Tool Solid Carbide Drill Bits are very different from carbide tipped drill bits. 

Solid carbide drill bits are much more effective in deep holes, 

can go through hardened steel, 

have much better heat tolerance and 

can be sharpened many times (diamond stone is required to sharpen tungsten carbide)

• ★【Premium Bright Finish 2/Pack】 multi-purpose solid carbide drill bits provide better rigidity than high speed steel bits. It is extremely heat resistant and used for high speed applications. Our tungsten carbide (WC) bits has the advantage of cutting metal either "wet" or "dry" and they provide solutions for many businesses such as aerospace drilling jobs for aircraft mechanics, precision machining, hobby supply, etc.
• ★【Recommended For Use On】 aircraft metals chrome titanium inconel stainless steel Alloys Steel Low-Medium-High Carbon Steel Aluminum Copper Glass Plastics Composite Materials Cast Iron -- Our Carbide drills stay sharp many times longer than traditional steel bits making them ideal for the toughest of applications!
• ★【Optimal Design for Metal Work】 118° four facet point angle minimizes drill wander and assures accurately sized holes. Our jobber length, precision ground carbide drills are designed for high feed rates with good chip disposal. smooth finish on the bits increases chip flow. Spiral flutes are constructed with a higher flute angle to remove chips more easily.
• ★【Specs】 Flute Length: 1-3/8 inch, Overall Length: 2-1/2 inch, Drill Size: 5/32 inch // Tungsten Carbide Grade (ISO): K20 // Binder: %8 Cobalt // Hardness: 91.3 HRa // Uncoated
• Tungsten carbide is a composite material, although it looks like a metal, it is a composite of Tungsten carbide powder mixed with cobalt as a binder metal, the resulting material is more like a ceramic than a metal. It is a very hard material being a 9 on the Mohs scale where diamond is a 10 and hard steel around 5. It will chew down into most anything but the hardness makes them brittle with virtually no plasticity. Unstable drilling can result in a broken bit. These drills like a a rigid dri

User questions & answers

Question:	Can you re sharpen these carbide bits with a drill doctor
Answer:	Yes. With a diamond wheel, Drill Doctor will sharpen these solid carbide bits
Question:	Need to drill through welded up holes with precision for auto-body moldings. You figure these will do the trick or? Think they'll shred the paint
Answer:	I don’t have experience drilling through paint, so I can’t be 100% certain. But these bits are very sharp, and drilling through steel I get clean precise holes. They’ll cut through en hardened steel pretty well. They are also very hard - carbide bits are easy to break. Go slow, use tapping or cutting oil if you can, and keep the drill perpendicular to the workpiece. If you twist or torque the bit it will probably break.
Question:	did anybody tried this on AR500 steel or similar very strong steel
Answer:	Yes, it cuts better than any other material I've found. However, carbide is VERY brittle, so the alignment of the point of engagement, and maintenance of concentricity with the intended hole are vital. These will chip or break much more easily than the typical HSS(high speed steel) drill bits.
Question:	Is there an optimal spindle speed for drilling hard steel, or the lower the speed the better
Answer:	I am not 100 % certain. My battery drill has 10 settings (the lower setting are really just for use as a screw driver) and I normally set it near the higher end and it works well with these bits. My corded drill has three settings and these bits cut through everything (including hardened tool steel) at any setting.

Product description

Features:

Diamond Tipped Drill Bit Set Twist Drill Bits 10pcs/Set

Size: 0.8 / 1.0 / 1.2 / 1.5 / 1.8 / 2.0 / 2.5 / 3.0 / 3.5 / 4.0mm

Use Range: jade, metal, Agate, Jade, gemstones, pearls, pendants, Cobblestone





Package Includes:

1 x 10pcs/Set Diamond Tipped Drill Bit Set Twist Drill Bits

Note: Different material hardness, the effect is different

The color of Package in random

• ♥【High Efficiency and Fast Cutting】—Sharp twisted drill bits will make the drilling easier and more effortless
• ♥【High-Valued Package】—There comes with 10 pieces of twist drill bits in the package, you can use them for a long time upon different occasions
• ♥【High Standard Material Ensures Long Lasting Performance】—This Jobber Drill Bit Set is made of high quality material, and it is finished with fine polish to offer a good durability
• ♥【Different Sizes Meet Different Needs】—This Twist Drill Bit Set have different sizes to meet your different drilling requirement, and the sizes are 0.8 / 1.0 / 1.2 / 1.5 / 1.8 / 2.0 / 2.5 / 3.0 / 3.5 / 4.0mm, you can use them for different purposes
• ♥【Widely Applications】—It is widely used in the drilling of jade, metal, Agate, Jade, gemstones, pearls, pendants, and cobblestone

User questions & answers

Question:	Can these be used with Dremel rotary tools
Answer:	Yes you can. I bought them to make holes in semi precious stones for jewelry, but they were not strong enough

• ▲90pcs Diamond Burrs - Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing; Work on glass, metal , stone, ceramic, wood, plastic
• ▲Sold Storage Box - PC plastic box is sturdy, falling resistant and moistureproof, easy for carrying and hanging; All parts were in order and set was complete, well organized to prevent scattered and confused
• ▲Different Sharp Bits Accessories - 30 Style different sharp router bit can reach More Carving, Great for all types of detail work.
• ▲Wide Usage - 1/8" diameter shanks, compatible with most rotary tools; Ideal for home improvement, craft and whenever you need to polish, grind, drill, cut, engrave, and more,used with most rotary tools ,Able to engrave on a wide range of materials including: wood, ABS, acrylic, PVC, plastics, etc. Well-suited for detailed work, such as building and sanding dollhouse furniture, model trains, or miniature buildings,Highly recommended for jewer
• ▲What You Will Get - ZFE 90-Piece rotary tool carving,engraving bits kit and our best service

User questions & answers

Question:	Does it work with dremel
Answer:	Check your phone for messages or emails and could be coming in the next shipment or, due to human error was delivered somewhere else.
Question:	Where is the rest of my order
Answer:	Yes
Question:	Will they work on aluminium
Answer:	Not sure of the grit or grade of coatings but all three are the same. When I purchased them I thought they were different. No remorse though as I imagine some will break or wear out or get lost. Still pleased with my purchase.
Question:	What grit are they? Is each set the same grit or three different grit sets
Answer:	These tools are made for 15000 RPM and to a Maximum of 35000 RPM range. Your hand drill has a maximum of 1200 to 3500 RPM. They will fit but the user will struggle to maintain control of either the drill or the material being cut. Note: it may be possible to cut and remove material from balsa wood, or styrofoam withe these bits, but I wouldn't recommend it. If your looking for a tool that has nice cutting ability for these bits try using JET JAT-401 Pneumatic R6 Die Grinder, 1/4" https://www.amazon.com/dp/B010VAC95W/ref=cm_sw_r_cp_apa_i_tkkaEbMRS290F powered by an air compressor, or Populo High Performance Rotary Tool Kit with 107 Accessories, 3 Attachments, Variable Speed, Flex Shaft and Universal Collet for Abrasive, Polish, Cutting, Engraving, Drilling and Crafting DIY Project https://www.amazon.com/dp/B07HRHC9X7/ref=cm_sw_r_cp_apa_i_2mkaEbHW2S958

Product features

Evenly distributed particles

ZFE tools have multiple layers of fine industrial diamond particles bonded to the tips which provides for longer drill life.

Different Sharp Bits Accessories

30 Style different sharp router bit can reach More Carving, Great for all types of detail work.

High-quality materials

1/8" diameter shanks, compatible with most rotary tools.ZFE tools are excellent for drilling through materials up to 1/2" thick.

Hardness

Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing; Work on glass, metal , stone, ceramic, wood, plastic

Sold Storage Box

PC plastic box is sturdy, falling resistant and moistureproof, easy for carrying and hanging; All parts were in order and set was complete, well organized to prevent scattered and confused

ATTENTION：DO NOT RUN DRY

Wet drilling only. The diamond coating is very thin. Can not take any abuse.

Start the hole at an angle.

Carefully move the drill around just enough to ream out the sides of the hole.

STEP 1

Press and hold the safety lock and unscrew the interface.

STEP 2

Put the diamond burrs into the interface.

STEP 3

After putting the grinding needle, tighten the connector.. Exercise on waste materials when using for the first time.

• High Quality Diamond Coated Drill Bits Assorted Pack of 20 pieces
• 4 Different Sizes - 1mm, 1.5mm, 2mm, 2.5mm - 5 pcs. ea. Total of 20 pieces
• Fits drills, flex shafts and dremels.
• Used by Jewelry Designers for drilling clean holes on Beach Sea Glass, Sea Shells, Rocks, Marbles, Stones, etc.
• Make your own custom earrings, pendents and bracelets.

User questions & answers

Question:	Need to drill 30 screw holes in plexiglass and Lexan panels, will the bit last through 30 holes and do I need to cool bit while using
Answer:	You're better off with regular drill bits you wouldn't want to use this type of drill bit with diamond bits it will cause additional heat and melt the plastic vs. drill through cleanly. These are a very abrasive way of drilling and only used for masonry or actual glass.
Question:	Do these work with a dremel tool? Some of them look very small
Answer:	The two larger bits do fit my old Dremel with a smaller chuck. The 1.5 mm fits the chuck on my drill press. Alas, the 1 mm needs a small chuck and the two I have bought from Amazon are tedious to align and do not work very well. Frankly, you would probably promptly break both the 1.5 and 1 mm in a Dremel because they are so delicate and need precise alignment for drilling. I have used all the bits with a drill press (with PLENTY of water and SLOOOW pressure) and they work great. One broke simply because I moved the vise and snapped it off. I broke a 2 mm, but simply used the broken bit for another bunch of holes. Broke again and I am now using a stub and it works just fine. Obviously, not deep holes! Drilling on polished rocks of different varieties. Work great.
Question:	New to the dremel scene. how come every time i buy dremel bits they don't fit my dremel head they fall out!! what part am i missing??? help please
Answer:	You need to buy a different Collet . Take your Dremmel tool and the bit you want to use to Lows. The salesman will help you buy the collet that you need
Question:	I am looking for diamond bits to drill holes in 6mm glass for jewelry. Would these work
Answer:	tThey are awesome, one trick to keep them from over heating and dulling, find u a stainless steel pan cover what u r drilling with water, then drill. the drill bits will last a long time, i have used them on steel when i make weapons to,water keeps them cooled down. they are a great set of bits.

Product features

Diamond Drill Bits for Sea Glass

Diamond Drill Bits

Diamond Drill Bits for Sea Glass

Drill at 3,000-4,000 RPM.

Drilling Stones

Water is needed to keep the tool cool. Allow the bit to do the work (as opposed to applying pressure). These bits will get a good clean hole through stones.

Drills through porcelain

Drills through porcelain for custom arts, crafts, and jewelry . Drilax Diamond Drill Bits

1mm Diamond Drill Bits 5 Pieces

1mm Diamond Drill Bits 5 Pieces

1.5mm Diamond Drill Bits 5 Pieces

1.5mm Diamond Drill Bits 5 Pieces

2mm Diamond Drill Bits 5 Pieces

2mm Diamond Drill Bits 5 Pieces

2.5mm Diamond Drill Bits 5 Pieces

2.5mm Diamond Drill Bits 5 Pieces

Product description

High Rigidity Diamond

This tile hole saw are made of industrial grade carbon steel with nickel-plated coated body that resist corrosion. Thicken corundum coating on the tops offers superior cutting strength for maximum drilling outcomes.

Extraordinarily Sharp

Each hole drill bit was processed by a smooth and exact finish that lower the incision resistance and drill pressure, increase the sharpness and the use of water lubrication. Excellent for making clean and precise hole on glass or ceramic and considerably extending drill bit life.

Large Clearance Hole

These ceramic drill bits along with large clearance hole facilitate the entrance of cooling water and escape of chips. Making the drilling process more easy and relax.

Widely Application

There are 15 different sizes included with this glass drill set to meet various demands. Perfect for drilling glass, tile bottles, blocks jars, fiber glass porcelain tile ceramic, vitrified, brick and stone.

15 Sizes

Each drill bit set includes: 0.24", 0.32", 0.4", 0.48", 0.55",0.63", 0.11", 0.79", 0.87", 0.98", 1.02",1.11", 1.18", 1.57", 1.97"

Total length: about 2".

Package Contains

15Pcs* Diamond Coated Drill Bit

Attention:

Please keep the speed within 800-1000 per minute, low drill pressure and increased use of water lubrication will extend drill bit life.

And please keep adding water when the diamond drill bits are working on the glass or ceramics.

• 【EXTREME HARD 】These diamond drill bits are made of industrial grade carbon steel with nickel-plated coated body to resist corrosion. A thicken diamond coating on the tops offers superior cutting strength for maximum drilling outcomes.
• 【EXTRAORDINARY SHARP】Each diamond hole saw has a smooth and exact finish that lower the incision resistance and drill pressure, increases the sharpness, and effectiveness of water lubrication. Excellent for making clean and precise holes on glass or ceramic and considerably extending drill bit life.
• 【LARGE CLEARANCE HOLE】These glass hole saw set along the drill bit facilitate the entrance of cooling water and escape of chips and other particles from drilling. Makes the drilling process easier.
• 【WIDE USAGE】 15 different drill bits included with this glass drill bit set to meet various demands. Perfect for drilling glass, tile, porcelain tile, ceramic tile, brick, and stone.
• 【 LIVE SUPPORT 】 For any questions, call or email the contact information that comes with the package. We stand behind our high quality products.

User questions & answers

Question:	Does it work with quartz countertop
Answer:	According to the Mohs Hardness scale, Glass is a hardness of 4, Quartz is a hardness of 7, and Diamond is a hardness of 10. The process is not actually cutting, but rather abrading, as the "cutting" edge grinds it's way through the material. Diamond coated tools will easily go through Quartz; just take your time and only apply gentle pressure and plenty of water to keep the blade cool and remove the Quartz particulate so the work area doesn't sludge up.
Question:	Will this cut 1/2" safety glass
Answer:	Dear valued customer Greeting! Yes, the diamond hole saw can cut 1/2" safety glass. Warmest regards StarQualityBargain Team
Question:	Why are these called "diamond hole saws" if they are made of corundum? corundum is not diamond
Answer:	Thank you for inquiry. The glass hole saw was coated diamond on the head for superior cutting strength. The description has been revised, thank you for your kindly reminding.
Question:	Do these go into a standard drill
Answer:	Dear valued customer Greeting! The diamond drill bits are compatible with most drills Warmest regards, StarQualityBargain Team

Product description

♣ GOXAWEE Tool - Grinding Tool - Rotary Grinding Bit - 1/8 Inch Shank Diamond Grinding Burr Drill Bits Sets for Craft Projects and DIY Creations



★GOXAWEE Diamond Burr Bit Set is a new brand and professional for Abrasive Tools. 



★Various Shapes: Such as sphere, cone, cylinder, round head cylinder, bullet, flat plate, etc. 



★Universal Compatibility:3 mm (1/8") Diamond rotary bits fit for dremel rotary tool and mini grinder & mini drill. 



★Great Gift for DIY Enthusiasts: High working efficiency, perfect grinding effect. Convenient to engrave, simple to use, safe and reliable. 



▲NOTE: Please add water for cool when using diamond bits. 



♥ GOXAWEE Tool ♥ is the source for hard-to-find mini tools for DIY crafts and hobbies. We take great pride in providing the best customer service in America. Whether you are a professional craftsman, a robot builder, or a model building hobbyist who requires precision small tools and micro tools, GOXAWEE Tool can help.

• ★ 60 GRIT: #60 Grit Diamond Rotary Grinding set, rougher surface which are quicker than the larger grit burrs when Sanding, Polishing and Engraving.
• ★ MULTI-PURPOSE: Diamond Grinding Head Burr uses on stone, glass, metal, hardwood, tile, ceramics, marble, granite and other hard materials
• ★ MULTI-FUNCTION: GOXAWEE Diamond Drill bits have 10 different grinding bits for abrasive, engraving, cutting, polishing, carving and etching
• ★ COMPATIBILITY: Universal 3mm (1/8") shank grinding drill bits fit for GOXAWEE G4007, G5045, dremel multitool and most rotary tools or die grinders
• ★ EXQUISITE PACKAGING: 20Pcs Diamond rotary burr set of higher quality is orderly packed in a nice bag as shown, easy to place and carry

User questions & answers

Question:	Where are these made
Answer:	1/8th inch shaft
Question:	what is the width of the bit
Answer:	I don't know, but they handle over 30,000 RPM just fine. That's my rotary tool top speed.
Question:	rpm max
Answer:	You will need a good set of diamond bits for rock work. Invest in a good set. All diamond bit wear out but quality bits have longer life. Working bits with water will extend the life even more. Use at low speed setting.
Question:	would this work on rock
Answer:	Not sure but I have ordered this set 3 times and was not in the least bit disappointed and I'm picky when it comes to stuff like that but u will be suppried

Product description

Diamond Point, Replacement Point for 10828

From the Manufacturer

Additional bit for the 290 Dremel Engraver. Use this diamond point for continuous duty or commercial work. Can also be used for decorative engraving.

• Engrave, decorate, or personalize a wide variety of materials - from metal to plastic to wood and leather using the Dremel 290 Engraver
• Dremel 9929 Diamond Point accessory is for use with the 290 Engraver and is ideal for decorative engraving and personalization on hard surfaces
• 9929 Diamond Point works best on steel, chrome, titanium, granite, and other hard substrates
• USA-BASED CUSTOMER SERVICE – Available by chat, email, phone or visit us at our service center in Racine, WI.

User questions & answers

Question:	will this tip work on stainless steel
Answer:	Never tried it on stainless steel but I think it will.
Question:	Does this work with the dremel
Answer:	Yes. It's made for the 290 dremel. It replaces the bit the 290 comes with it better bit.
Question:	Does it come with the tightening screw
Answer:	This 9929 is used for ONLY our 290 Engraving tool. This 9929 is just the bit (accessory), it doesn't come with a screw. (The screw is actually with the tool when you purchase it). If you have lost the screw, please call our toll free number to order another one. You can reach us at 1-800-437-3635, Mon-Fri, 8 am - 5 pm, CST
Question:	Will this bit work on engraving rocks or stones? If not which one should I use
Answer:	Thank you for your question! The Dremel 9929 Diamond Point Bit is designed to be used with our model 290 Engraver. The 290 Engraver is an impact engraver. By selecting a higher number on the engraver, it increases the impact. The 290 is capable of engraving in stone with either our diamond tip or our carbide tip (9924). However, to get more desired effects in the rocks/stones you are engraving, you may want to consider this product in addition to use of our high speed rotary tool on the materials you are working with. There is a larger variety of tips and options that can be used in a high speed rotary tool. For further information please contact Dremel at 1-800-437-3635, M- F, 8 AM - 5 PM (CST).

• Set of 30 pcs. Assorted Mixed 1mm 2mm 3mm 10 ea. Diamond Drill Bits - 1/8 shank
• Fits drills, flex shafts and dremels.
• Used by Jewelry Designers for drilling clean holes
• Drills Beach Sea Glass, Sea Shells, Rocks, Marbles, etc.
• Must be used with care submerged in a little pool of water

User questions & answers

Question:	What grit are these
Answer:	I am not familiar with grit except for sandpaper. I have purchased these 3 times. I use them for drilling glass. They are a mixed bag. One bit will do 25+ pieces of glass and another bit will break after i drill just a few. For the price i cannot complain. Seems the smallest bits are most fragile. I use them with my dremel flex shaft, not just attached to the dremel, which was a disaster. Hope it helps.
Question:	why does this not ship to canada
Answer:	contact Amazon for their policies
Question:	Can these drill into glass products other than seaglass? I would assume so but wanted to check for something such as glass bottles
Answer:	Jacob, I haven't tried drilling into glass with these. They are quite tiny in their circumference and I was worried that they could do the job on glass, so I ordered Dremel compatible larger diamond bits that are designed to drill glass, tile, and stone from DiamondBurs.Net LLC and they work great on wine bottles!
Question:	Can they be used on rock? Would like to make small holes in rocks (difrent kinds) to make jewelry
Answer:	Not sure. we used our set on ocean shells to make holes for jewelry. these shells are about 1/8" thick. we used a dremel housed in a Dremel 220-01 Multi-Purpose Articulation Workstation. without the workstation the bit slides around too much. Hope this helps.

Product features

Diamond Drill Bits for Sea Glass

Diamond Drill Bits

Diamond Drill Bits for Sea Glass

Start at a "slant". Drill under water. Drill slow at 3,000-4,000 RPM.

Drilling Stones

Water is needed to keep the tool cool. Start out drilling at a 45 degree angle, slowly move your drill into a vertical position, and allow the bit to do the work (as opposed to applying pressure). These bits will get a good clean hole through stones.

Drills through porcelain

Drills through porcelain for custom arts, crafts, and jewelry . Drilax Diamond Drill Bits, Case Included

Product description

DEWALT DW5572 1/4-Inch Diamond Drill Bit

From the Manufacturer

DEWALT DW5572 Heavy Duty 1/4-Inch Diamond Drill Bit

• Diamond Welded Tip for Greater life and Durability
• Reverse Spiral Thread Delivers Continuous Water Feed for Longer Life and Increased Speed
• Core Ejection Slot Removes Plug for Repetitious Holes

User questions & answers

Question:	Is this used in a rotary drill or a specialized tool
Answer:	Use any standard rotary drill at medium-low speed with plenty of water for cooling. No hammer drill; that will crack any ceramic/marble/granite.
Question:	Specifications says 1/4" drilling debth. How did you make it work for your granite that is 1.5" thick
Answer:	I'm not the 1.5" granite person, but I went through a 1 1/8" quartz countertop. I don't know why it says 1/4" drilling depth in the specs; the depth of the inside is 1 1/8" so that is the max depth you can go. Like the 1.5" granite person, I used a wood piece to hold it in place to get it started, then just kept water on it as I drilled. It took a long time; rocking back and forth a little helped as the bit dulled. Even with the 1 1/8" countertop I couldn't get all the way through so I had to tap the plug out and live with a little bit of ragged edge on the underside of the quartz. One more thing: if I had to do it again I would buy two bits and swap halfway through when the first one got dull.
Question:	What depth will this drill through? I'm going through a countertop that is just over an inch thick
Answer:	I use it to drill through glass bottles, so I cannot give you an exact answer, but I just measured the length of the bit at 1 and 3/16 inches. So, it might just work.
Question:	I need to drill thru a 1 1/2" GRANITE kitchen top, is this the right tool
Answer:	This is a diamond-tipped core bit. I used this exact bit to drill several holes through 3/8" thick marble (fragile). I would use it for quartz or granite, but it will be IMPERATIVE to keep the drill speed low, and to keep the bit submerged in water by making a clay ring "pool" around the drill area. I also would make a double-thick "X" out of duct-tape to protect the surface should the bit "walk" when you begin drilling. Use both hands on the drill and brace your arms as you start at a 45 degree angle to cut through the duct-tape and into the granite. You should be forming a "crescent" on the surface, at which point you can gradually move the drill vertical. Light pressure, medium-low speed, keep it cool with the pool, and refresh the water as you see fit. Good luck and have fun.

• 【Glass Drill Bit】These diamond drill bits are made of industrial grade carbon steel with nickel-plated coated body to resist corrosion. Fine workmanship and super wear-resistant, sharp
• 【High Quality Drill】Each hole is treated with smooth and accurate surface treatment,and the top oh the hole is thickened to achieve excellent cutting strength
• 【Tile Hole Saw 15 Sizes】 6/ 8/ 10/ 12/ 14/ 16/ 18/ 20/ 22/ 25/ 26/ 28/ 30/ 40/ 50 mm，to meet various demands
• 【Wide Usage】Used on Drill Glass,Wood,Tile Bottles,Blocks Jars, Ceramic,Slate Mable, Granite Light Stone, and other hard surfaces
• 【Attention】Please keep adding water when the diamond drill bits are working on the glass or ceramics.low drill pressure and increased use of water lubrication will extend drill bit life.

User questions & answers

Question:	Is there an available guide for this tool
Answer:	Not that I know of, I found cutting thru brick I had to take it slow. I just tipped the cutting tool slightly till I had started a slight half circle then was able to hold to start the full circle. I was very surprised that it did a nice job cutting thru the brick half at a time
Question:	Can this diamond drill bits be used for concrete
Answer:	Sorry, can't be used in concrete
Question:	Does this tool work with wood
Answer:	I would not use it for wood...it is designed for glass, acrylic marble etc...
Question:	Will these fit and work with a dremel
Answer:	I used a cordless drill. It would not fit my dremel. Also, I felt that I head better control cutting the stained glass with the cordless drill.

• HIGH QUALITY Diamond Coated Hole Saw Drill Bit Tool 1-1/4 inches Diameter.
• STANDARD 3/8 inch shank fits standard drill. DUSTLESS - FAST DRILLING 1-1/8 inch Depth of Cut
• INSTALL Secure Mount Anchors Shower Grab Bar Shelves - DRILL THROUGH TILES and Backer Cement Board

User questions & answers

Question:	Will this drill through stainless steel sink under the granite
Answer:	I used mine to drill through subway tile in the shower stall. It made short work of that but for stainless steal you better talk to a plumber or plumbing supply.
Question:	What is the id depth
Answer:	It would be about 1-1/4 inches deep inside the hole saw
Question:	Will it cut through clay house bricks? I understand I will have to break out the core left in the brick to get the necessary depth
Answer:	I'm sure it will. It cuts through porcelain tile, which is much harder. It will get dull much faster than a carbide tipped drill bit, which I think would be a better option for drilling through brick.
Question:	Can this bit used for drilling wallboard and wood
Answer:	This bit is made specifically for drilling (grinding really) in stone products. There are many other hole saws listed on Amazon, made for use on wood, and most likely would be a little less expensive also.

Product features

High-Quality Diamond Coating

Drilax High-Quality Diamond Hole Saw - Longer Tool Life

Drilling Faucet Holes in Sinks

Drilax Diamond Drill Bits for Drilling Faucet Holes in Sinks - Help of a Wood Template.

Using water with a sprayer

Marble, Granite, Quartz - Drilling Holes

Drilax Diamond Hole Saw Drill Bits for Drilling Holes in Marble, Granite, Quartz

Drilling Wall and Floor Tiles

Drilax Diamond Drill Bits for Drilling Wall or Floor Tiles, installing Shower Doors, Faucets, Drain Holes

Diamond Drill Bit Instructions

DUSTLESS and CLEAN HOLES

Drilax Diamond Hole Saw Drilling Quartz Countertop ( up to 1-1/8 inch thickness)

For thicker countertop applications, please seek for our 3 Pcs or 5 Pcs sets.

Using Wood Template

You can use a wood template to locate the diamond hole saw.

Bathroom Renovations

Drilling holes for faucets or pipes for bathroom renovations.

Drilling Floor Tiles

Drilling Floor Tiles - Bathroom Renovation

Complete Bathroom - Shower Renovation

Complete Bathroom - Shower Renovation with DRILAX Diamond Tools

• √ [1/8" Shank 1/4" Cutting Dia Carbide Rotary Burr Set] K Kwokker 10Pcs Carbide Die Grinder Bits. Shank dia: 3mm(1/8"), Cutting dia: 6mm(1/4"), fits dremel tool accessories and most small rotary tools. 10 different types of carving kit drill bits, meet your different needs.
• √ [Very Well Made And Tough As Nails, Nice Tungsten Carbide] Carbide burr set made of heat-treated durable carbide that lasts long working life, packed with nice plastic case for safety storage and protection.
• √ [Safe And Efficient, Like a Hot Knife Thru Butter] Tungsten carbide burrs drill bits for wood, metal, aluminum, plastic, stone, glass fiber, porcelain and other material.
• √ [This Is a Essential Rotary Burr Set] Grinding head for air die grinder. NOTE: When using the wood carving bits, make sure that the burr handle is fully inserted into the chuck and tightly clamped. Eye masks and gloves are recommended to prevent stab wounds.
• √ [Warmth Tips] The speed of the rotary tools usually is 6000-50000 revolutions per minute, long service life, reduce the inefficiency turnover. Machining drill bits, easy to cutting, durability. Really nice carbide drill bits.

User questions & answers

Question:	Are these good for detailed engravings and writing
Answer:	It may depend on the size of the shank. I order these specially to fit my Dremel shank size.
Question:	I have a Dremel hanging tool multi pro single speed drill from back in the day. Will these fit
Answer:	yes.
Question:	Will this fit my Dremel
Answer:	All of the bits will cut aluminum.
Question:	Hi. Can any of these bits be used to drill into aluminum? Thanks
Answer:	Barely. These are are poorly made.

Product features

K Kwokker 10Pcs Carbide Rotary Burr Set 1/8" Shank, 1/4" Head Length

• Material:Tungsten carbide
• Type:Carbide Rotary Burr Set
• Machining hardness reach HRA85.
• Total length: 43-51 mm
• Cutting diameter: 1/4 Inch(6mm)
• Shank length: 35mm
• Shank diameter: 1/8 inch(3mm).
• Suggested RPM: 25000-50000, Max RPM 70000.
• Quantity:10Pcs

Features:

Carbide rotary burr set processing all kinds of metal(burr bits for metal carbide burrs for steel including all sorts of hardened steel) and non-metal (such as marble, jade, bone).

• Machining hardness reach HRA85.
• For the most work rotary burr set can be replaced with small grinding wheel, and no dust pollution.
• High efficiency, high-quality finish, long service life, good economic returns.
• Easy to use, safe and reliable, can reduce labor intensity.
• Mechanical parts chamfering, rounding and groove processing.
• Dual Chamber is crossover lines, not easy to block the lines, more suitable for the object of relatively low density material.
• 10 different types: Oval, inverted cone, pointed cone, ball nose cone, ball nose, pointed tree nose, flame, ball, cylinder with round head, cylinder with end cut.