RockJock's JL/JT Coil Spring Shim Pack is great to have on hand when building a custom vehicle! No 2 custom vehicle builds are the same, especially once they are loaded down and have some miles on the build. Not intended to be coil spring spacers, having this shim pack handy allows you to shim your coils as needed to fine tune a lean by inserting a shim between the welded on coil spring axle pad and the coil spring isolator. Kit includes one 3/16 in. thick JL/JT front spring spacer, one 1/4 in. thick JL/JT front spring spacer, one 3/16 in. thick JL rear spring spacer and one 1/4 in. thick JL rear spring spacer.