Includes 50 burs and a plastic storage caseAssorted shapes and sizes for your detail work. Use them to remove burs on glass, metal, stone, wood, ceramics, fiberglass and plastic. Diamonds are nickel-bonded to the surface and are of fine to medium grit, medium grit for carving, grinding, sanding, etching and more... Each has a 1/8'' shank for use with motor tools, drills, high speed die grinders, and flex shafts, designed for dremel rotary tools.