30 Pack 1mm Diamond Drill Bit Jewelry Beach Sea Glass Shells Gemstones Lapidary 30pcs. 1/24 Inch Necklaces Earrings, Pendants, Bracelets, Beach, Tiles, Marble, Rocks, Ceramic, Porcelain, Case Coated Drills Burrs Set of 30 pcs. 1mm 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. For Making Earrings, Pendents and Bracelets.