... .4.Packaging: 1pcs/box,15kg/carton5.Treatment: surface quenching by high frequency induction or nitrogen treatment, carburizing hardened.6.Process: stamping, deep ... , automatic lathe machine, conventional lathe machine, milling machine, drillingSurface treatmentHeat treatment, polishing, PVD/CVD coating, galvanized, electroplating, spraying, chrome or nigrescence ...