Add to basket D.I.D 520 PREMIUM O-RING CHAIN R895.00 D.I.D. 520 Standard Roller Chain D.I.D. is the #1 chain manufacturer in the world Solid rollers Shot-peened parts High cylindrical and roundness accuracy Exacting tolerances provide low friction Pre-stretched Extended riveted bushing “Anti-Kink” design Special alloy steel Average tensile strength of 7,200 lbs. **Note: Recommended Chain Length is a based on OEM gearing and chain size. May require additional links or cutting if stock gearing has been altered.