Keep your upper and lower A-arm and knuckle in fighting shape with this quality repair kit. 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 for better wear and performance. All metal bushings are case hardened and plated to prevent wear and corrosion.