... 4.SGS,Rohs certification name of goods: Finished Hex Full Nuts — Zinc, FineMaterial:stainless steel,carbon steel,ironSurface:nickle plated,white ... )4.Bronze: C51000, C52100, C54400, etc5.Iron: 1213, 12L14,12156.Aluminum: Al6061, Al6063 etc7,.Carbon steel:C1006,C1010,C1018,C1022,C1035K ... customer and help solve problem after sales Finished Hex Full Nuts - Zinc, Fine