... 2008 certified 2.OEM manufacturer 3.+/-0.01mm tolerance 4.QC inspect after products finished 5.Steel A:certification: ... ( C26800), C37700 ( HPb59), C38500( HPb58), C27200(CuZn37), C28000(CuZn40)4. Bronze: C51000, C52100, C54400, etc.5. Iron: 1213, 12L14, ... broaching, welding,stamping, and assembly.F.Package suitable for sea and air transportation or as required metal mobile phone part for touch screen