Zinc plated, Nickel plated, Passivation, Oxidation, Anodization, Geomet, Dacromet, Black Oxide, Phosphatizing, Powder Coating and Electrophoresis, etc Standard: ISO, DIN, ANSI, JIS, BS and Non-standard. Certificate: GB/T19001-2008/ISO9001:2008 It can match ROHS,SGS and environment protection http://www.tuofamachining.com