... 40Mn bluing or shot peening, we are one professional chain factory ,producing both standard roller chains and nonstandard ... 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 of ANSI,ISO,DIN,BSetc.Quality can be guaranteed! sharp top chain ...