The Scotch-Brite EXL Unitized disc "wipes off" scratches and scuff marks on precious metals. Remove porosity and parting lines in castings. Also great for deburring and polishing of all metal alloys as well as many plastics and composites. The disc has a peel-and-stick back for sticking to Jooltool backpads. Includes one fine grit disc. For use with Jooltool.