20 Diamond Bur Jewelers Lapidary Rock Rotary Tools 1/8" This is a new set of 20 diamond coated burs This master diamond bur set allows you to shape, grind and finish with precision Great for filing glass, ceramics, tile, brick, plastics, wood, fiberglass, stone, rock carbide, gold, platinum, silver, metals or anything else that is hard Recommended for jewelers, lapidary, hobbies and crafts, modeling, home repair, etc Assortment includes various sizes of round, cone, inverted cone, tree, bud, cylinder and knife edge burs