Regina 520 Pitch RH2 Series Plain Chain. Designed to ensure high resistance to elongation and to the severe impulsive stresses caused by Off-Road riding. Extended bushings and solid rollers, alloy carbon steel pins, shot-peened plates to offer increased tensile strength and fatigue resistance are some of the most important features. RH2 chains feature shaped bushings and special "X" chromized alloy carbon steel pins, together with special beveled plates to provide sure engagement in the most severe Off -Road applications.