The Fein K500 Sanding Sheet with Foam Backing (63717246010) is designed for the Fein MultiMaster for removing scratches form paints, get coat, acrylic, and polycarbonate windows, clear finished rood, furniture, and much more. This 4-1/2" circular sanding sheet is perfect for achieving the highest possible surface quality. It features foam lamination and a hook and loop attachment, and is the perfect precursor to polishing with a felt polishing pad and Fein Extra polish.