The abrasive is ready mounted on a backing pad. The pad attaches to the quick change adaptor with a simple twist and lock. So partially used abrasive can be kept and reused at some later time. Available in packs of five 25mm diameter discs in either: aluminium oxide discs (180 grit) for steel, Zircon-corundum discs (50, 80 and 120 grits) for stainless and alloy steels or polishing fleeces for cleaning, finishing, and removal of paints (in extra fine, fine and coarse).