... .All kinds of surface treatments are available:polishing, zinc plating, nickel plating, chrome plating.5.Made of carbon steel,piano steel,SUS,alloy steel ... ,Sandblast and Anodize,Chromate, Polish,Electro Painting,Black Anodize,Plain,Chrome plated,Hot Deep Galvanize(H. D. G. ) etc.Heat TreatmentTempering,Hardening,Spheroidizing ...