... 4. Bronze: C51000, C52100, C54400, etc5. Iron: 1213, 12L14,12156. Aluminum: Al6061, Al60637.OEM according to your requestProducts Availablebolts, screws, nuts ... sheet,galvanized steel sheet or tube),stainless steel,copper ,brass,aluminum,etc4.Finish:zinc plated,chromated plated, Electrophoresis, Dacromet ,powder ... metal component/sheet metal processing/metal stamping parts Sheet Metal Components