The Forney 3 inch x 1 inch mounted flap wheel features durable, high-grade aluminum oxide coating for aggressive cleaning and refinishing on most wood or metal surfaces. Ideal for mounting on power drills or other chuck driven machines. Can be mounted on electric drill or other machines with chuckMaximum RPM 20000Shank Mounteddurable, high-grade aluminum oxide coating for aggressive cleaning and refinishing on most wood or metal surfaces