Upgrade worn ball joints on your SPC Performance Adjustable Upper Control Arms with these redesigned joints. Designed, engineered, tested, and assembled in Colorado, these completely redesigned, heavy duty ball joints feature A new Grease able design A new hybrid 2 - piece race and internal spring compensate for wear and maintain turning torque and OE lash requirements for life of vehicle. A massive 36mm ball that is highly polished and coated with electroless - nickel to provide a hard, smooth wear surface for life of vehicle. Sealed boots to retain grease and protect from the elements 80 degrees of joint articulation to maximize droop travel without bind These ball joints are a direct replacement for the original jointsthat came with our 25620 upper control arm set. These ball joint sets are sold in pairs, so only one kit should be needed per vehicle. California Residents WARNING