This is a replacement upper pillowball spacer for the Air Lift Performance series struts. Upper pillowball spacers are used to center the top of the camber plate and act as a buffer between the mounting nut that holds everything together and the actual pillowball bearing of the upper mount.
This product is brought to you by Bag Riders and is not affiliated with or endorsed by Air Lift Performance. Bag Riders is not an authorized distributor of Air Lift Performance.