... ,carbon steel 2.surface: zinc,nickel,chrome 3.free sample 4.SGS,Rohs certification name of goods: Finished Hex Full ... Nuts — Zinc, FineMaterial:stainless steel,carbon steel,ironSurface:nickle plated,white zinc,black ... , etc5.Iron: 1213, 12L14,12156.Aluminum: Al6061, Al6063 etc7,.Carbon steel:C1006,C1010,C1018,C1022,C1035K,C10458, Alloy steel: SCM435 ...