20 Piece 1/4" Shank High Speed Diamond Burr Grinding Bits

20 Assorted shapes 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 120 to 150 grit.. Each has a 1/4" shank for use with rotary tools, drills, and grinders.