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About the productVery popular drilling burr tools used by Jewelry Designers for drilling holes in Beach Sea Glasses, Stones, Rocks for making Necklaces, Earrings, Pendants and Bracelets.Product Features:Quantity:30pcs1/8 inches ShankThe total length of 1.77 inchesPlastic box packaging, easy to carry and storeCan drill Beach Sea Glass, Sea Shells, Rocks, Marbles, etc.ATTENTION: DO NOT RUN DRYWet 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 Included:30 Pcs Premium Diamond Drill Bit