50pc 60 Grit Diamond Burr and Wheel Set, 1/8 inch shank. This set includes may vary from picture. Packaged in a brittle plastic box, so the box may be broken or the bits may be bulk. Diamond coated accessories will cut into glass, wood, metal, stone, practically anything. For longer life, use with a cooling agent such as Eurotool Cut Lube. For use with Dremel Type Rotary Tools.