... ,By Auto mechine make it. Extrusion new mechine:"Bihler" Automatic Stamping Metal 1: stamping parts material: Copper, Brass, Bronze, CuSn ... , computer electronics. 3: Process: punching, riveting, welding, metal processing 4: Applied software for specification drawings: Auto CAD, ... , Japan auto stamping and riveting assembly system. 6: Surface finishes: Nickel/silver/gold plating. Polishing 7: Products ...