... head self tapping screwA: SpecificationMaterial:stainless steel,copper,alloy steel,aluminum,copper,carbon steelSurface Finish:nickel plated,white zinc,black zinc ... )4.Bronze: C51000, C52100, C54400, etc5.Iron: 1213, 12L14,12156.Aluminum: Al6061, Al6063 etc7,.Carbon steel:C1006,C1010,C1018,C1022,C1035K ... . will be a good manufacturing partner as your need. slotted hexagon flange head self tapping screw