... 2)high precision 3)quality be assured 4)competitive price and service 1)Equipment:stamping machines,Hydraulic press machines,Auto-Turning ... carbon dioxide gas arc welding and argon-arc welding 2)Material: iron, carbon steel, stainless steel, brass, copper, alloy steel, aluminum, cold rolled steel3 ... -coating, Silkscreen, Heat treatment, Black oxid metal non-stard stainless steel tension coil spring