... diameter:12mm 5.pitch:12.70 Specificationsindustrial transmission roller chain sprocket MaterialC45,40Cr,20CrMnTi,42CrMo,stainless steel ..... as per your requestprocessForging ... bag and carton box wooden case Some details of our sprocket Sourcing from us brings you profit, and your OEM/ODM ... relations with you in the near future. industrial roller chain sprocket