... High frequency hardening on the teeth ,and chain model is 415.420.428.520.530,etcsurface treatment ... meet your size and other model design to finish te product or to make semi-finished products.Main ... east, Africa, South America If you need to know more information,please contact meMotorcycle chain type ... you or something you like, just according to your needs.Model:____________ (415,420,428,428H,520, ...