... 2.Size:M6-M8 . 3.Material:65# manganese steel or carbon steel . 4.Finish:Yellow/White. We can design and ... total;2) Material: iron, carbon steel, stainless steel, brass, copper, alloy steel, aluminum, cold rolled steel with various plating; 3) Surface treatment ... design & fabricating; 5) Inspection:Three lines of inspections before packing. Coating thickness tester, Roughness tester, Go /Ungo Gauge, ...