A "ball joint kit" is a set of components or a package that typically includes ball joints and related hardware necessary for the replacement or repair of ball joints in a vehicle's suspension system. Ball joints are crucial components that connect the control arms to the steering knuckles, allowing for the movement and pivot of the wheels. Over time, ball joints can wear out, leading to handling issues and safety concerns. A ball joint kit is designed to provide the essential components for replacing these worn or damaged ball joints.