The Ninja 3M Flexible Diamond Grinding pack comes with three discs to quickly shape, smooth or remove material on stone, metal and composites. Featuring an open-dot pattern on polyester backing, this abrasive provides excellent flatness control on metals. The discs have peel-and-stick backs for sticking to the Ninja Cushion or Jooltool backpads. Use wet at slow speeds. Includes one each of 250, 125, and 74 micron (60 grit, 120 grit and 220 grit) diamond discs. For use with Jooltool.