Euro Tool Bur Stand & 40 Diamond Grinding Burs Set This is a new set of 40 diamond coated burs These are medium 100 grit 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