... 2.Size:M6-M8 3.Material:65# manganese steel or carbon steel 4.Finish:Yellow/White We can design ... , professional teamwork, prompts communication service. Our features: 1) Equipment: We own Stamping machines, Hydraulic press machines, Auto-Turning machines ... ' requests, with in-house tooling design & fabricating; 5) Inspection:Three lines of inspections before packing. Coating thickness tester, Roughness ...