... . Length: 45mm, 60mm 4. Grit: 120# 5. Application:Assorted shapes and sizes for your work. Use them to remove burrs on ... glass, metal, stone, wood, ceramics, fiberglass and plastic. Diamonds are nickel-bonded to the surface and are of fine to medium grit ... use with motor tools, drills, high speed die grinders, and flex shafts.6 The materials are top quality to ensure long working ...