520UO O-Ring Colored Red Motorcycle Chain Our motorcycle chain meet or exceed DIN, ANSI,ISO,BS,JS ... standard, and stand up to the Our motorcycle chain meet or exceed DIN, ANSI,ISO,BS,JS standard ... with you in the near futureGeneral Standard for Roller Chain:ROLLERSolid RollerMaterial 1035,1045 or 1050Through harden with ... 45HRCShot peening per the spec 520UO O-Ring Colored Red Motorcycle Chain