Precision cnc machining second hand car part 1. Specification of second hand car part ItemDescriptionMaterialAluminum: 5000series(5052...)/ 6000series(6061…)/ 7000series(7075…) Steel: Carbon Steel, Middle Steel, Steel Alloy, etc.Stainess Steel: 303/304/316,etc.Copper/Brass/Bronze/Red Copper,etc.Plastic: ABS, PP, PC, Nylon,..