Allstar Upper Control Arm Shim Kit contains upper type shims that have a dual mount design for use with a 6 inch bolt spacing. The shims are slotted for 1/2 inch bolts. Included are one each of the shim thicknesses of . 125 inches, . 185 inches, . 250 inches, . 375 inches, . 500 inches, . 750 inches and 1. 00 inches. These shims allow for easy adjustment of the caster/camber during front end alignment. The additional one-piece dual mount shims are also available individually if needed (all are sold separately). It is backed by a 90-day limited factory and is sold in one complete kit.