Kit is 100% bolt-in, no drill, no cut for Factory Suspension 4x4 or 4x2 models and features 304 stainless steel mounts and fasteners. Air springs are rated at 5,000 lbs. at max 550 psi. Air fittings are brass DOT rated push-to-connect with single 8’ DOT air fill line. Kit ships complete with everything needed to install.