Replace worn ball joints on your SPC Performance Adjustable Upper ControlArms with these new joints. Designed, engineered and tested in Colorado, these completely revised, heavy duty ball joints feature:• A new Greaseable 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 Geomet finished to provide a surface for a long service life• Sealed boots to retain grease and protect from the elements• 80 degrees of joint articulation to maximize travel without bindThese ball joints are a direct replacement for the original joints that came with the Chevrolet Colorado and GMC Canyon truck upper adjustable control arm sets.