Polaris RZR RS1 Billet Aluminum Radius ArmsSolid Billet Aluminum Radius Arms Strength, style, and utility thats what you get with a set of SuperATV Billet Aluminum Radius Arms for the Polaris RZR RS1. The solid 7075 billet aluminum bar is 32mm in diameter compared to 19mm stock. The hex design gives these rear suspension links even more strength and rigidity. The heavy duty 5 8 chromoly heims are adjustable on the fly thanks to the flat sides of the hex bar. All of that plus a lifetime