ACDelco ball joints are designed for easier steering. ACDelco chooses the best design for the application, often incorporating advanced technology some competitors don't match. Product Features:Superb strength and durability thanks to precision manufactured housing and componentsAdvanced corrosion protection against the harshest conditionsPermanently attached boot reduces contamination, makes installation easierFull ball stud and patented two-piece cylindrical wedge bearing for tighter overall fit and fatigue resistanceNo spring means no end play, easier installationOne-piece forged housing for easier steering