... . Material:Carbon steel,stainless steel,copper ,brass,aluminum,etc2. Finish:zinc plated,chromated plated, electrophoresis, powder coating,etc3. Standard:OEM manufacturing as per ... , hardness tester, concentricity tester etc 4) Finish: Clear IRIDITE, Polishing, zinc plating, nickel, chrome plating, yellow zinc5) Quality assurance in accordance ...