The Eibach Lift Block system is designed to increase the lift on solid - axle trucks that use leaf spring suspension. The Lift Block system consists of a pair precision machined from 6061 - T6 billet aluminum blocks, a set of U bolts to secure them to the axle, and bump stop spacers (when necessary). Available in 1 and 1.5 lift heights, Lift Blocks are the perfect complement to your PRO - TRUCK COILOVER or PRO - TRUCK - LIFT system.