These massive oil-filled shock absorbers are ready to soak up the terrain! Between the aluminum body, the 6mm shock-shaft and heavy spring rate, they're excellent for larger custom builds and 1/5 scale R/C projects. The shocks contain eyelets that are able to accept M4 or 8-32 UNC hardware for a solid mounting solution. The aluminum main-body is threaded so that you can adjust your oil level or swap it for a different weight. The threads are also used for the preload adjustment nut - the preload nut is able to be easily adjusted down the body of the shock in order to increase the compression of the spring, allowing the shock to ride higher in its stroke.