RockJock's JL, JT and JK Front Spring Tower Frame Plugs are a simple, easy to install component that look clean as well as serve a function! In climates where vehicles see a lot of water and mud, debris is able to collect within the coil spring towers and rot them out. Capping these holes is the solution! This set of 4 plugs are CNC machined black Delrin, providing a semi-gloss black finish. Upper and lower plugs index into one another and lock into place with a bolt that provdes o-ring crush, affixing the assemblies into the holes.