various of roller chains,used for motocycle. 420,428,,428H,530 etc material: carbon steel. we are one professional chain factory ,producing both standard roller chains and nonstandard chains.majior product is :A and B series roller chain,straight side roller chain,H series of roller chain, motocycle chain ,other roller chain .Zinc-plated,Nickel-plated,Docromet-plated etc.Comply with the standard ...