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SPTA 60Pcs Diamond Drill Bit Burrs(20pcs 1mm, 20pcs 2mm, 20pcs 3mm) 5Pcs 3mm Twist Drill Bits 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 Shank: 1/8 inch The total length: 1.77 inches package: Plastic box, easy to carry and store suitable for: 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: 20Pcs 1mm diamond burrs 20Pcs 2mm diamond burrs 20Pcs 3mm diamond burrs 5Pcs 3mm twist drill bit