90 PCS DIAMOND BURRS Excellent for fine detail work, cutting, engraving, carving, touching up and finishing, working on glass, metal, stone, ceramics, wood, plastic< /p> 30 Different Style Router Bit Can Achieve More Carving, Ideal For All Types Of Detail Work In Glass, Metal, Stone, Ceramic, Wood, Plastic Beach Jewelry Glass Sea Shells Gemstones Lapidary, Necklaces Earrings, Pendants, Bracelets, Beach, Tiles, Marble, Rocks, Ceramics, Porcelain, Coated Burrs Drill Bits 1/8" diameter shank, compatible with the most rotary tools, ideal for home improvement, hobbies, crafts and anytime you need to polish, grind, drill, cut, engrave and more with most rotary tools Material: Alloy; Diameter: 3mm / 0.12inch Product Very popular drill bit tools used by jewelry designers to drill holes in beach sea glass, stones, rocks for making necklaces, earrings, pendants and bracelets. Specifications: Quantity: 90pcs Diamond Burrs 1/8 inch (3mm ) Shank The total length of 1.77 inches Plastic box packaging, easy to carry and store Can pierce beach glass, shells, rocks, marbles, etc. CAUTION: DO NOT RUN DRY Wet drilling only. These are delicate diamond drill bits, with a very small diameter. The diamond coating is very thin. I can't take abuse. Start the hole at an angle. While holding the drill in your hand, carefully move the drill just enough to scroll the sides of the hole. Let the tool do the work. Package Includes: 90Pcs/3 Box Diamond Burr Grinding Wheels