Unmounted Flap Wheel 4"x1"x5/8" A120 / METAL, STAINLESS STEEL, NON FERROUS, ALUMINUM, COPPER, WOOD, PLASTIC, FIBERGLASS - Ideal for cleaning, finishing, polishing, deburring and blending. For use on steel, cast iron, stainless steel and nonferrous materials such as aluminum, copper, wood, plastic and fiberglass.