... .Material aluminum, mild steel, stainless steel, chrome steel, cold rolled sheet, bearing steel, brass, ... copper, bronze, chrome copper, mold steel , teflon ,PVC, bakelite, nylon ... treatmenthardening, carburizing, high frequency, anodizing, clear anodizing,black anodizing ,chrome plating, black oxide coating, nickel plating, zinc plating, nitriding, degreasing, ...