... , iron (carbon steel), copper or aluminum ,Plastic etc.2) Main equipment: CNC lathe, automatic lathe, hand lathe grinder, thread rolling machine ... , tapping drilling machine etc.3) Advanced measuring & testing equipment: Projecting apparatus, roughness tester, hardness tester, concentricity tester etc.4 ... , zinc plating, nickel plating or chrome plating, phosphating etc. Brass fitting