... ,Coper,Carbon steel2): Finish:Polishingblack, zinc plated (blue, white, yellow), hot dipped galvanized.trivalent zincZ/PCR3+.Phosphating,black3): Standard:ANSI ... steel,brassStandardstandard fasteners (GB, DIN, ANSI,JIS AND ) and non-standard.GradeClass 4.8, Class 6.8, Class 8.8 ... , Material or Grade, surface, If it is special and Non-standard products, please supply the Drawing or Photos or Samples ...