Drilax&trade; 30 Pcs Premium 1mm Diamond Drill Bit Burr Set 1/24" (1mm) Jewelry Necklaces Earrings, Pendants, Bracelets w/ Sea Shells, Beach Glass, Tiles, Marble, Rocks, Ceramic, Porcelain, Gemstones Lot 30 Case Coated Drills Burrs Drilax300101 NEW Premium Quality Set of 30 pcs. 1mm (1/24") Diamond Drill Bits - 1/8 shank Good for Dremel 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.