30 pcs SET 10 pcs. 1mm 10pcs. 2mm 10 pcs. 3mm Diamond Drill Bit Cylindrical Burr Kit Jewelry Beach Sea Glass Shells Gemstones Lapidary 30pcs. 1 mm 2 mm 3mm (1/8") Set of 30 pcs. Assorted Mixed 1mm 2mm 3mm 10 ea. 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. Must be used with care submerged in a little pool of water