Steeda billet front coil over kits mount coil over springs (not included) and allows for fine tuning of ride height. A nylon tipped set screw locks the collar without damage to the threads. This kit has a 2-piece upper spring perch with a flat, Torrington-type roller bearing which allows the spring to rotate under compression. An O-Ring is included to keep dirt out of the bearing. CNC machined to exact tolerances with an anodized finish for longevity. For use on cars with standard front struts.