Polishing treatment of the parts of plane and automobile, metal wares, Stainless steel wares (knif, fork kitchen utensils, tableware, vacuum flask, etc.); House metalwares (like handles, hinge, lock, etc.); Metal watchband, lamps and lanterns, racket of Gulf; Copper wares, aluminium wares, plating copper and bronze, etc.; Woodenware, plastic wares, marble, etc. Must abide the rotation direction marked with arrow on the wheels.