... . Material:Carbon steel,stainless steel,copper ,brass,aluminum,etc2. Finish:zinc plated,chromated plated, electrophoresis, powder coating,etc3. Standard:OEM manufacturing ... tester, concentricity tester etc 4) Finish: Clear IRIDITE, Polishing, zinc plating, nickel, chrome plating, yellow zinc5) Quality assurance in accordance with ISO9001: 2008 ...