High performance value of o-ring chain, D.I.D. is the #1 chain manufacturer in the world, 520VO uses 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 ideal for ATV’s and Quads up to 250cc average tensile strength of 6,830 lbs.

-O-Ring
SDH Pin
-Heavy Duty