... high precision 2,Material: carbon steel 3,customized according to your demand 4,ISO9001 certificated Specifications:Material: carbon steelSurface treatment: zinc ... materials, like copper, brass, bronze, aluminum, stainless steel, and carbon steel etc.3, the processing technique we adopt has many ... punching, cold drawing, spinning, forging and so on.4, our company is located in the capital of China ...