30 Diamond Coated Burs This is a set of 30 diamond coated burs These are 40 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 Assortment includes various sizes of round, cone, inverted cone, tree, bud, cylinder and knife edge burs Provides uniform cutting on wide a variety of materials Use water for lubricant All have a 1/8" (3 mm) shank Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.