RockJock’s rear coil spring shim for JL Wrangler is 3/16 in. thick and mounts between the welded on coil spring axle pad and the coil spring isolator. These shims are used to fine tune vehicle height per model, engine combination and added weight load. Shims may be stacked a maximum of 2 high. Semi-gloss black powder coat finish. Kit Includes:- One (1) rear coil spring shim Fits:Jeep Wrangler JL 2 Door (2018+)Jeep Wrangler JL 4 Door Unlimited (2018+)