This kit is what every racer needs in his trailer to make the shock adjustments needed to run upfront. Kit includes .062 , .125 , .250 , .375 thin shims for .500 and .625 shaft shocks along with 8 bump stops 4 with .500 shaft hole and 4 with .625 shaft hole . The bump stops are 4 different hardness's Light Blue 40a , Black 55a , Orange 65a and Purple 75a . Shims have a hole for easy removal using the removal tool provided with the kit .