... Aluminium part: Finishing:Black oxidized. Aluminum part:1 Available materials: brass, mild steel, steel alloy, stainless steel and iron, aluminum, ... electrolyte-polish, chrome, zinc plating, nickel plating, aluminum oxidation, others plating coating. 4 Available processes: metal ... stamping, die-cast and hot-press, expert plastic injection, and surface plating. 5 OEM orders are welcome. Aluminum part