1-Hardness treatment,good finishing 2-Guarantee:100,000KM Timing ChainMaterial: Link Plate, 65Mn; Pin, SUJ2 or SCr440; Bush, 20CrMnMoProcess: ... , Zinc-plated, Nickel-plated, Chrome-platedPin and Bush with polishing treatment, and pin with accurate grindingHardness: Pin, RC60; Link plate, RC47Pin Diameter ... : S45C, PA66Hardness: S45C, HRC18~22; PA66, HRC75~80Guarantee: One year Timing Kit