These are bolt-in replacement coilovers from Fox Shox. These are 2" dia bodies with 5/8" shafts (similar to most 2" shocks/coilovers). These come ready to install and will offer 1.5-2.0" lift on 4wd Xterra/Frontier/ Pathfinders depending on year and current stance. These ride really well and ride height can be adjusted. Sold in pairs and spanner wrench is NOT included.