... the surface Product No./NameJJ-00065 / Aluminum prototype with plating zinc alloy for mobile mold Manufacture Process1) Drawing ... Treatment: High quality polish, powder coating, Chrome/Nickel/Zinc(white, blue, yellow, black)plating, hot galvanized, painting, Anodize, electrophoresis ... etc...6) Tolerance: +/- 0.0005inch, also accord with GB6414 Aluminum prototype with plating zinc alloy for mobile mold