... treatment: Trimming, polishing, cleaning, finishing, passivation, including infiltration & double plating6) Full Inspection7) PackingProduct Description1) Material: Aluminum alloy2) Surface Treatment: high quality ... , Anodize, electrophoresis, sandblasting etc...6) Tolerance: +/- 0.0005inch, also accord with GB6414 Zinc die cast, Zinc die casting part, Zinc casting with double plating