Aluminium part: Finishing:Black oxidized. Aluminum part:1 Available materials: brass, mild steel, steel alloy, stainless steel and iron, aluminum, zinc 2 Available diameter ... to Φ120mm 3 Available surface finish: fine polish, electrolyte-polish, chrome, zinc plating, nickel plating, aluminum oxidation, others plating coating. 4 ... injection, and surface plating. 5 OEM orders are welcome. Aluminum part