... , progressive stamping, deep drawing, welding, spot welding, tapping, polishing, and assembly, complying with customers’ drawings.We ... , progressive stamping, deep drawing, welding, spot welding, tapping, polishing, and assembly,,according to customers' drawings or ... steel ,Cold Rolled steel,Spring steel,Electro galvanized Steel,Aluminum alloy,brass,Copper, according to customer request4).Finish: ...