hex nut 1.material:stainless steel,carbon steel 2.surface: zinc,nickel,chrome 3. ... Finished Hex Full Nuts — Zinc, FineMaterial:stainless steel,carbon steel,ironSurface:nickle plated,white zinc,black oxideSize:M2-M22Min ... etc5.Iron: 1213, 12L14,12156.Aluminum: Al6061, Al6063 etc7,.Carbon steel:C1006,C1010,C1018,C1022,C1035K,C10458, Alloy steel: ... problem after sales Finished Hex Full Nuts - Zinc, Fine