The Joes RR Arm is built from a solid billet versus being bent as is standard for our competition. Bending causes stress fractures in the aluminum. Joes spends the time to machine the arms from solid billet eliminating the need for bending producing the strongest arm possible. All hardware included and a machined spud that allows your shock end to run bind free! Black anodized and laser etched. Our torsion products fit the popular ⅞”-48 spline found on most Micro Sprints.