All Balls Racing - A-Arm Repair Kit (50-1067)Kit contains all of the components required to rebuild the upper and lower A Arm and knuckle. Needle bearing shafts are made with 52100 bearing steel that has been hardened and precision ground. Self lubricating Acetal nylon bushings protect better against wear and performance. All metal bushings are case hardened and plated to prevent wear and corrosion. New series of kits now include hardened and precision ground pins that replace the OEM plated