14 best drill bits for glass

Product description

Engineered for use in Glass, Regular and other specialty Tiles (Specialty Tiles that may be harder than normal ones). 4-Piece set with most common sizes.

From the Manufacturer

Glass and Tile applications have never been easier! Nobody but Bosch is offering the innovation found in our product design. This 4-Piece set of our product features an unique product geometry with a precision tip, high quality carbide and reinforced head that results in best-in-class speed and life when cutting in glass and tile.

• PRECISION: Features Bosch’s unique product design with a precision tip to help solve any bit wandering or bit walking
• QUALITY: This glass and tile set includes a high-quality carbide tip with a reinforced head to reduce stress, prevent bit cracking and the diamond ground cutting edges provide a longer life
• VERSATILE: Perfect for common applications such as relief holes for glass cutting, bathroom and shower installs, drilling and fastening mirrors, setting concrete screws in tile and many more
• RELIABLE: The three flat shank provides superior grip on 5/16 in. bits and larger to prevent slippage. The Bosch Glass & Tile bits are easy to use while still providing best-in-class speed so you can get the job done faster
• INNOVATIVE: Featuring the Bosch branded, innovative geometry allows bits to drill faster. Each bit is clearly labeled so you can select the correct fit for the task. Included drill bit sizes: 1/8 in., 3/16 in., 1/4 in., 5/16 in
• Precision tip - Solves bit wander and bit walking
• 4-Piece set with most common sizes

User questions & answers

Question:	Do I need to purchase any other equipment, other than a cordless drill, to be able to make a 1/4" hole in a glass bottle
Answer:	each shelf can bear 80 lbs.
Question:	Will these drill through the bottom of a Clausen pickle jar
Answer:	Yes, there is a bracket thAt can be attached to the top of the shelf and to za wall.
Question:	When would you use these (for glass and tile) instead of the cylindrical diamond bits
Answer:	They are packaged loose, you will have to assemble. It was packaged very well.
Question:	What is the exact diameter of each bit include? Please, no "small" or "probably" answers
Answer:	Each shelf can withstand a weight of 80 pounds, six shelfs can withstand 480 pounds

Product features

Diamond ground cutting edges

Delivers long bit life.

Centering tip

Reduces bit walking.

Reinforced head

Maximizes bit life.

Three flat shank

Provides superior grip on 5/16" and larger bits.

• ✔ Satisfied Size - 6mm/0.23", 8mm/0.31", 10mm/0.39", 12mm/0.47", 14mm/0.55", 16mm/0.62", 18mm/0.7", 22mm/0.86", 26mm/1.02", 32mm/1.26"
• ✔ Ideal Application - This diamond coated core drill bit removes a complete circle from glass, marble, tiles,granite, ceramic or other.They are perfect for drill glass, tile bottles,blocks jars, fiberglass porcelain tile ceramic, slate Mable, granite light stone
• ✔ Super Material - These diamond drill bits made of high-speed steel that is durable and have a long sevice life,which are high quality and good performance that excellent for making clean and accurate hole.
• ✔ Sharp&Smooth Cut - Coated with high quality diamond, the diamond hole saw creates a high precision, smooth cut with no broken edges. Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably
• ✔ Note - When you using the diamond drill bits, please use lubrication (water),otherwise the diamond core drill will burn.Not for use on Concrete or for depths beyond about 1/2".

User questions & answers

Question:	Drill though iron sink
Answer:	Hi，out wet tile saw included one piece of Diamond blade .The Arbor Size is 5/8'',outer size is 7''.
Question:	Can these be used on sterling silver sheet
Answer:	Hi，our tile cutter is used for cutting marble and tiles.
Question:	Can you use this to cut a hole in a glass wine bottle
Answer:	There is a bottle of clear included with the kit which is supposed to be used to seal the color. Mix the colors to get as close a color match as possible and then seal it.
Question:	Does this set come with a case
Answer:	I do not think it would work

Product features

Super Material

These diamond drill bits made of high-speed steel that is durable and have a long sevice life,which are high quality and good performance that excellent for making clean and accurate hole.

Specifications

Size: 6mm/0.23", 8mm/0.31", 10mm/0.39", 12mm/0.47",

14mm/0.55", 16mm/0.62", 18mm/0.7", 22mm/0.86",

26mm/1.02", 32mm/1.26"

 

Note

When you using the diamond drill bits, please use lubrication (water),otherwise the diamond core drill will burn.Not for use on Concrete or for depths beyond about 1/2".

What Materials Can I Use Diamond Drill Bits On?

Diamond drill bits are perfect for drilling holes through hard materials such as these:

• Glass, sea glass, beach glass, fused glass
• Stone, gemstones, rock, pebbles
• Ceramic, porcelain, tiles, glazed pottery, plates
• Shell, antler, bone, fossil
• Very hard wood

Diamond Drill Bits - Why should I Choose?

• Small Diamond Drill Bits have a solid end and therefore a larger surface area so they last longer than the small diamond core drills, but may take longer to drill a hole. They are more robust and therefore ideal for very tough, dense pieces of sea glass, very hard stone, precious stone, gemstones, hard shell, bone and antler.

 

• If you're a regular user of diamond drill bits it is worth having a combination of both small diamond drill bits in your tool box as sometimes you don't know if you have a very tough material until you start drilling!

Operation Note

• As with all diamond drill bits you should use water as a lubricant and coolant.
• Being hollow, allows the water to flow up inside and around the inner core of these drill bits as you are drilling, helping to keep the drill bit cool and removing the debris.
• Start your hole diagonally, make a round trace and then hold drill straight.

• 【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.

Product description

Diamond Drill Bit Set, Drillpro 10 PCS Glass Hole Saw for Tiles Glass Ceramic Marble Bottles DIY,6mm -- 30mm



Diamond Drill Bits, are also know as Diamond Core Drill Bits, Diamond Hole Saws or Bonded Diamond Drill Bits. They are often called Glass Drill or Tile Drill, but they are much more versatile since they are used to drill glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone, and fiberglass.



Features:



- This is a brand new product

- This diamond bit core drilling removes a complete circle glass, tiles, marble, granite, ceramic or other material and only needs water for lubrication

- Can be used with a standard electric drill (not included)

- Easy to use, high quality, good performance, long life

- Excellent for making clean and accurate hole on glass, tile and marble

- Always use lubricant (water), otherwise the diamond core drill will burn

- Start the hole diagonally, make a round trace and then hold drill drittoSpecifica



Specifications:



Model: 10 Pcs 6mm -- 30mm



Size:

6mm / 12:23 ", 8mm / 0.31", 10mm / 0.39 "to 12mm / 0:47", 14mm / 0:55 ", 16mm / 0.62" 18mm / 0.7 ", 20mm / 0.78", 22mm / 0.86 ", 30mm / 1.17"



Note:



If you smell burning, back off! Either your speed is too high or the pressure you're applying is too much. You're drill bit should never be hot to the touch, not even warm.

- Slowest speed

- Coolant

- Minimum pressure



The general rule is the smaller the diameter of your drill bit, the faster drill speed you can use. The harder your material, the slower drill speed you should use.

Packaged included:

10pcs Diamond Coated Hole Saw Drill Bits

• SMALL RESISTANCE: Small incision resistance, opening speed is quickly, easy removal of chips and other advantages.Also help to open accurately. Large chip holes to ensure that when the punching smooth, punching accurate.
• DURABLE: Nickel-plated with a diamond dust coating offers superior performance and cutting strength.Extended service life.This diamond drill bits are high quality and good performance that excellent for making clean and accurate hole.
• IDEAL FOR: This diamond coated core drill bit removes a complete circle from glass, marble, tiles,granite, ceramic or other.Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.
• TIP: Can be used with a standard electric drill (not included), Always use lubrication (water), otherwise the diamond core drill will burn. Warnings: Not for use on Concrete or for depths beyond about 1/2"; Water is required for lubrication when drilling.
• 10 SIZES: Total 10 different sizes (6mm,8mm,10mm,12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 30mm).Different sizes meet your different needs,help you in different places.

User questions & answers

Question:	will these cut through plastic and gourds? Thank you in advance
Answer:	Without a doubt. These bits, in a drill press, will easily cut through aluminum or brass bar stock.
Question:	Will work on quartz crystal and ir gemstones etc. Jewelry as well
Answer:	DO NOT believe so, it is designed for glass, ceramic, tile etc.
Question:	will this cut clay pottery
Answer:	Probably, just use water to keep the bit cool
Question:	Can these be used on antique glass insulators? (I have no idea how insulator glass compares to other glass
Answer:	That is what we used these on. We used a drill press and made sure the glass was in water to keep the temperature down.

Product features

Diamond Drill Bit Set, Drillpro 10 PCS Glass Hole Saw for Tiles Glass Ceramic Marble Bottles DIY,6mm -- 30mm

Diamond Drill Bits, are also know as Diamond Core Drill Bits, Diamond Hole Saws or Bonded Diamond Drill Bits. They are often called Glass Drill or Tile Drill, but they are much more versatile since they are used to drill glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone, and fiberglass.

Features:

- This is a brand new product

- This diamond bit core drilling removes a complete circle glass, tiles, marble, granite, ceramic or other material and only needs water for lubrication

- Can be used with a standard electric drill (not included)

- Easy to use, high quality, good performance, long life

- Excellent for making clean and accurate hole on glass, tile and marble

- Always use lubricant (water), otherwise the diamond core drill will burn

- Start the hole diagonally, make a round trace and then hold drill drittoSpecifica

Durable

• Nickel-plated with a diamond dust coating offers superior performance and cutting strength.
• Extended service life.This diamond drill bits are high quality and good performance that excellent for making clean and accurate hole.

Model: 10 Pcs 6mm -- 30mm

• 6mm / 12:23 "
• 8mm / 0.31"
• 10mm / 0.39 "to 12mm / 0:47"
• 14mm / 0:55 "
• 16mm / 0.62" 18mm / 0.7 "
• 20mm / 0.78"
• 22mm / 0.86 "
• 30mm / 1.17"

Large chip holes

• Large chip holes to ensure that when the punching smooth, punching accurate.

How to use?

Step 1: Clean the surface and mark down the position of the drill hole, angle drill 45 degrees to start the hole slowly.

Step 2: Keep wet with water.

Step 3: Being drilling at low speeds. Angle drill to vertical position once the hole has appeared.

Step 4: Slow speed down to drill the hole off and for the exit hole to prevent a breakthrough.

Note: If you smell burning, back off! Either your speed is too high or the pressure you're applying is too much. You're drill bit should never be hot to the touch, not even warm. - Slowest speed - Coolant - Minimum pressure

The general rule is the smaller the diameter of your drill bit, the faster drill speed you can use. The harder your material, the slower drill speed you should use.

• [Quality Material] Made of high quality cemented carbide. Good performance, making clean and accurate holes for you. A set of glass drills that are very easy to work with.
• [Superior performance] Small incision resistance,feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily.
• [Wide Application] Professional glass and tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, china, mirrors and glass. Cross tip design reduces breakout and the bit features a carbide tip for extended bit life.
• [Using Caution] Remember to add water to the materials while cutting or drilling to preserve them from over heating.
• [Wide Fit] Can be installed in the general electric hand drill, bench drill, impact drill and so on. The machine drill clamp range is 10mm and above.

User questions & answers

Question:	Are these better than Diamond drill bits
Answer:	They can be wiped down or sprayed, and the top is non-porous so the only concern would be nooks around the clip.
Question:	I would like to have only 3/16" for porcelain tile and to start 20 pcs (only
Answer:	They should. They worked on my students’ iPads.
Question:	there are six bits but the cutting diameter is only given for five. What is the cutting diameter of the sixth bit
Answer:	plastic
Question:	Are you able to purchase individual drill bits
Answer:	Yes they do. I have a screen protector on my MotoG6 and these work just fine.

Product features

Please add water or coolant when drilling ,good coolant can prolong the life of the drill and significantly increase the drilling speed.

• 1) One drill bit replaces two drill bits (1x glass & tile drill bit + 1x Mansonry drill bit), ideal for drilling fastner holes in bathroom tiles, or wall mirrors. Once it drills through the tile or mirror this drill bit will cope easily with any masonry behind it
• 2) Spear pointed design strong tungsten carbide tip can easily penetrate various material(tile, concrete, brick, glass, plastic and wood,etc) and reduces breakout
• 3) 5 Pcs drill bit set with 4 different sizes: 2x 6mm(1/4"), 1x 8mm(5/16"), 1x 10mm(3/8"), 1x 12mm(1/2")
• 4) U type slot design with fast drilling dust remove, 3-flats shank allows drill bit to be held tightly and stably in power drill. When drilling hard material (glass, porcelain floor tile, marble or granite), please use water for lubrication
• 5) Heavy duty drill bits made by factory that manufactures products for big international tool brands with guaranteed quality. For genuine multi-material drill bit, please identify QWORK brand drill bits packed in sealed transparent plastic box with two sides of blue color stickers

User questions & answers

Question:	Can I drill thru ceramic pots
Answer:	Well number 1: I doubt that you had a 1.5 inch masonry bit. In any case, a masonry bit works best with a hammer drill. If you have a 1.5 dimond drill then you don't need a hammer drill, just a standard drill and water on the drill site. Most stucco coats are less than .5 in think and the diamond drill will work fine. These are good drills and handled correctly will last through many holes. D
Question:	How many holes will a bit last in 1/4" wine bottles
Answer:	Yes, just check how large the chuck of your Dremel can hold. If you can hold 3/8 shank size, you can use all .
Question:	I’m drilling holes in concrete basement floor and after 6 holes drilled I found myself going nowhere after a 1/4”. Stay sharp after lots holes
Answer:	No, it broke when I tried it and it barely scratched the tile. I had to use two other type drills to mount a safety bar.
Question:	Can i use a regular cordless drill with this drill bit or do i need a hammer drill to drill through the stucco concrete of the outside of my house
Answer:	yes, but it will not drill through ceramic.

Product features

QWORK Multi-Material Drill Bit Set

One drill bit replaces two drill bits (1x glass & tile drill bit + 1x Mansonry drill bit), ideal for drilling fastner holes in bathroom tiles, or wall mirrors. Once it drills through the tile or mirror this drill bit will cope easily with any masonry behind it.

When drilling hard material (glass, porcelain floor tile), please use water for lubrication.

Product Specification

• Package quantity: 5 Pcs, 2x 6mm(1/4"), 1x 8mm(5/16"), 1x 10mm(3/8"), 1x 12mm(1/2")
• Material: High quality tungsten carbide tip
• Shank: 3-flats shank
• Package: Transparent plastic box
• Used for：tile, glass, ceramics, cinderblock, plastic and wood,etc

• 【SATISFY ALL YOU DEMAND】:Package includes 10 Pcs drill bit set BONUS STORAGE BOX with 6 different sizes: 1/8" (3 INCH LENGTH - 2 INCLUDED), 1/4" (4" LENGTH - 2 INCLUDED), 1/4" (6" LENGTH - 2 INCLUDED), 5/16 (6" LENGTH), 3/8" (6" LENGTH - 2 INCLUDED), and 1/2" (6" LENGTH).Suitable for most general-purpose bench drill, electric drill and drilling machine with drilling function. Gift Box-Keep your masonry drill bit set organized with the convenient storage plastic case.
• 【UNIQUE DESIGN】: One drill bit replaces two drill bits (1 x glass & tile drill bit + 1 x Masonry drill bit), can easily drill holes on tile, glass, ceramic, plastic, wood, etc. The U type slot design brings fast drilling dust remove, and 3-flats shank allows drill bit easy plug and to be held tightly.
• 【HIGH HARDNESS, DURABLE】: High-quality Tungsten carbide, and carbide with a reinforced head that prevents bit cracking and provides a longer life, the hardness is higher than the ordinary drill bit.
• 【WIDELY USED】: Spear pointed design strong tungsten carbide tip can easily penetrate various material (glass, ceramic tile, marble, wood, travertine, ceramic, stone, concrete, brick, cinder block, hard plastic,etc.)
• 【ATTENTION & LIFETIME SERVICE】: During drill hard material, such as glass, ceramic tile, marble, please use water for lubrication. We offer Lifetime service,Money back and Unconditional replacement for the defective products, please feel free to contact us by email for a solution if there are any problems.

User questions & answers

Question:	Is there a warranty on the drill bits
Answer:	Yes, this is the exact drill i have. Used these bits to drill holes in marble backsplash.
Question:	Can i use these bits with any power drill to go thru brick
Answer:	I am not sure? what makes Mesquite unique?, harder than? Internet says 2x hardness of oak. I would venture, yes. I would also recommend something more suitable for wood like https://www.amazon.com/DEWALT-DW1720-Brad-Point-6-Piece/dp/B005GOM3VO/ref=sr_1_4?keywords=wood+drill+bit+sets&qid=1559298614&s=hi&sr=1-4
Question:	Will these cut through tempered glass
Answer:	I don't see why not. I used my Black and Decker cordless drill to drill a hole in my brick.
Question:	Will these go through glass bottles
Answer:	It's plastic. There is a small tab on the back that you pull to open it. It makes it really nice if you can't use the whole ream in your printer at once. Keeps it nice and tidy. If you don't know about the tab, it could be difficult to open....

Product features

Why do you choose ZINMOND Tungsten Carbide Drill Bit Set?

--One drill bit replaces two drill bits (1 x glass & tile drill bit + 1 x Masonry drill bit), strengthen hardness and durability,which can make drill holes more easily on tile, concrete, brick, glass, ceramic, plastic, wood, etc.

--The surface of the drill bit goes through total grinding processing and anti-rust treatment, so the drilling and chip removal is smoother, plus higher hardness and more wear-resistant than ordinary drills.

--The U type slot design brings fast drilling dust remove, and 3-flats shank allows drill bit easy plug and to be held tightly.

--The triangular edge design is combined with the special slotting process to facilitate the ash discharge, greatly improving the punching efficiency.

Widely Usage

This masonry and concrete drill bit set can be used for ceramic tile, brick, marble, concrete, glass, plastic, wood, and so much more!

Sturdy & Sharp

Masonry drill bits are made with carbide tips which keep their strength and sharpness longer than traditional steel bits, rust resistant, and can easily puncture various materials.

Easy to Storage

Keep your masonry drill bit set organized and in one place with the convenient plastic case, easy to find it and storage,save your time.

How to Install Multi Material Drill Bit

Step One -- Unscrew the drill chuck and put the triangular handle into the drill bit.

Step Two -- Tighten the triangle drill with a tightener and install the multi material drill bit.

Step Three -- Use WATER or COOLANT for lubrication.

Step Four -- Try to keep the drill vertical when drilling.

Product description

MACP Glass drill bits help to make drilling into glass, tile, ceramic and mirror easier.

Many users shy away from drilling into these materials for fear of cracking or breaking the fine material. Slow and steady wins the race. Drill slowly and ensure you apply water at regular intervals to keep the bit and material cool. This should help to reduce cracking and breaking. MACP Glass and Tile bits are made with premium, micro grain carbide. The carbide points are automatically centered and welded onto the drill body to ensure accurate placement for straight holes.



● Precision ground spear tip reduces bit skating and walking

● Premium carbide with a reinforced head prevents bit cracking and provides a longer life

● 6-drills: 1/8", 3/16", 1/4", 5/16", 3/8", 1/2"



Application:

✔ Install towel racks

✔ Install a shower door

✔ Installed a bath seat

✔ Install shower curtain

✔ Install toilet paper rolls

✔ Make hole in ceramic pots

✔ Install a grab bar in a shower



Special Note When Using the Drill Bit:

▶ Do not use impact mode of drills or hammers when use the Drill Bit.



▶ The drilling speed of the Drill Bit should be slow, especially in the beginning of drilling.



▶ Please try to keep the drill vertical and use WATER or COOLANT for lubrication when drilling.



Provide 24 hours service

We only care about your satisfaction. We try our best to ensure each product is in perfect condition before you get it, but if something is not up to your satisfaction, please contact us for a full refund or replacement.

• Applications: Zine Coated Glass Drill Bits Set 1/8",3/16",1/4",5/16",3/8",1/2" with Hex Shank for Ceramic Tile Marble Mirror & Glass , Can’t be used to drill hard tile.
• High Quality: Made of special grade of long service life tungsten carbide tip with sharped cutting edges; drill bits are carbide tipped for long service life, avoids breakage and more resistant to extreme loads for longer tool life. Hardened steel design stands up to the toughest daily use.
• Smooth Hole: Position drill by making slight dent with the tip before drilling. Small incision resistance. Feature drilling stably, opening neat, smooth, no broken edges, no tremor phenomenon, chip easily.
• Safe operation: Drill at a low speed to avoid fracture. Use water lubrication will extend drill bit service life considerably.
• Notice: Do not use with hammer drill, water lubrication must be used to follow these instructions.

User questions & answers

Question:	Will these bits work on plastic? What is the best style of drill bit for acrylic sheets
Answer:	Yes it works plastic
Question:	Will this works for crystal
Answer:	Not sure
Question:	Will these driil bits work on hard tile or soft tile
Answer:	Hello, our drill bits set with hex shank is suitable for soft ceramic tile, marble, mirror & glass, and can’t be used to drill on hard tile. Thank you!
Question:	Can I use these drill bits to drill drainage holes in terra cotta pots ? thx
Answer:	Yes

Product features

MACP Glass Drill Bit Set

● Precision ground spear tip reduces bit skating and walking

● Premium carbide with a reinforced head prevents bit cracking and provides a longer life

● 6-drills: 1/8", 3/16", 1/4", 5/16", 3/8", 1/2"

Carbide Tip

Made of special grade of long service life tungsten carbide tip with sharped cutting edges; drill bits are carbide tipped for long service life.

High Stability

1/4 inch Hex Shank fits into all power tools more easily and securely, especially for locking into quick change chuck.

Smooth Hole

Feature drilling stably, opening neat, smooth, no broken edges, no tremor phenomenon, chip easily.

Appications

✔ Install towel racks

✔ Install a shower door

✔ Installed a bath seat

✔ Install shower curtain

✔ Install toilet paper rolls

✔ Make hole in ceramic pots

✔ Install a grab bar in a shower

Product description

About the product

Very popular drilling burr tools used by Jewelry Designers for drilling holes in Beach Sea Glasses, Stones, Rocks for making Necklaces, Earrings, Pendants and Bracelets. Aiskaer tools have multiple layers of fine industrial diamond particles bonded to the tips which provides for longer drill life. Aiskaer tools are excellent for drilling through materials up to 1/2" thick.

Product Features:

Quantity:1mm 20pcs 2mm 20pcs 3mm 20pcs

1/8 inches Shank

The total length of 1.77 inches

Plastic box packaging, easy to carry and store

Can drill Beach Sea Glass, Sea Shells, Rocks, Marbles, etc.

ATTENTION: DO NOT RUN DRY

Wet drilling only. These are delicate, very small diameter diamond drill bits. The diamond coating is very thin. Can not take any abuse.

Start the hole at an angle. While holding the drill in hand, carefully move the drill around just enough to ream out the sides of the hole. Let the tool do the work.

Package include:

1mm 20pcs 2mm 20pcs 3mm 20pcs

• 1mm 20pcs. 2mm 20 pcs. 3mm 20pcs.Diamond Drill Bits - 1/8 shank
• Practical - Suitable to be used with hand drills, flex shafts and dremels.
• Perfect Jewelry Design Necklaces Earrings, Pendants, Bracelets with Sea Shells, Beach Glass, Rocks
• Make Clean Holes in Tiles, Marble, Rocks, Ceramic, Porcelain, Gemstones
• Experience needed, you may break few bits during practice. Use with water - do not run dry.