New Diamond Coated Grinding Wheel. This is a new diamond coated 80 grit grinding wheel. This is great for filing glass, ceramics, tile, brick, plastics, wood, fiberglass, stone, rock carbide, gold, platinum, silver, metals or anything else that is hard. Longevity is assured as the diamond particles are electroplated onto the surface of the metal. Recommended for jewelers, lapidary, hobbies, crafts, modeling, home repair, etc. Can be used with a Dremel tool. The wheel measures approximately 1/4" (6.5 mm) thick with a 1/8" (3 mm) shank.