The upper control arm connects the wheel hub and the knuckle to the frame of the vehicle along with the lower control arm, it allows the wheels to move up and down precisely. A ball joint connects the control arm to the wheel and it safely allows for pivot movements for a smooth and comfortable ride. Made of high-quality cold-drawn tubes steel pipe which provides suspension durability. Installing lifted control arms can improve and increase the strength of the suspension and ride height, have an aggressive look and wider room for the wheels when pivoting the steering wheel. This kit includes castle nuts, grease zerks, polyurethane bushings, 1.25 DOM bushings, ball joint pins, pre-installed dust boot shields and dust caps for a complete and proper replacement. This control arm has 0 to 2 inches lift alignment. It can be easily located at the front axle attached to the frame of the vehicle. Please note alignment should be done after installing for proper vehicle operation. Compatible with the following: 2004-2020 F-150 This is a compatible replacement part manufactured by AA Ignition. This control arm suspension kit is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this control arm kit fits.