2 Diamond Coated Wheels Jewelers Lapidary Tool 7/8 These are a new set of diamond coated grinding wheels They are 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, crafts, modeling, home repair, etc Longevity is assured as the diamond particles are electroplated onto the surface of the metal Can be used with a rotary tool