... 3.+/-0.01mm tolerance 4.QC inspect after products finished 5.Steel A:certification: ISO9001:2008B.Products Available bolts, screws ... (CuZn37), C28000(CuZn40)4. Bronze: C51000, C52100, C54400, etc.5. Iron: 1213, 12L14,1215 etc.6. Aluminum: Al6061, Al6063, ... broaching, welding,stamping, and assembly.F.Package suitable for sea and air transportation or as required metal mobile phone part for touch screen