Poison Spyder Rocker Knockers are the ultimate protection for your Jeep's vulnerable rocker panel area. As the trails get tougher and recreational off-roading gets more and more hardcore, vehicle body damage becomes more prevalent. And rocker panels are most vulnerable, taking hits from both underneath and the sides as you work your way through tight obstacles. Poison Spyder Rocker Knockers protect your rocker panels by cladding them in rugged, high strength 3/16" plate steel armor. Rocker Knockers are manufactured to hug the lines of your Jeep's rocker panels perfectly, forming a glove-fit with virtually no loss of valuable ground clearance. Specifically engineered for most Jeep CJ, YJ, TJ and LJ models, Rocker Knockers are CNC laser cut from high strength 3/16" plate steel, and precision brake-formed for a perfect fit. Bolt holes are countersunk for the included stainless steel flat head hardware, which yields a flat, unobstructed surface to slide over obstacles. All mounting hardware is included as well as detailed installation instructions. Poison Spyder Rocker Knockers bolt to your Jeep's body in key areas, and interface with strengthened areas of the underside of the tub such as body mounts, strengthening ribs, etc. Because they mount to the body itself, there is no resulting gap or misalignment when a body lift is installed. For added side protection on the trail, these Rocker Knockers come with a tubular Slider. The Slider is crafted of high strength DOM structural tubing, welded to the Rocker Knocker with additional DOM tube spacers. The result is a combination of rocker panel protection and a tubular slider to keep your rig's body sides a few precious inches away from taller rocks and trees. The Slider may also become an integral part of your driving strategy, as it may be useful to pivot the vehicle around obstacles while searching for traction. It also serves as a short entry step, assisting entry and egress. For installations in which you would like to protect the paint underneath the Rocker Knocker, as well as provide a measure of vibration absorption, we offer Rubber Rocker Liners, precisely cut to fit between the Rocker Knocker and the Jeep's body. Be sure to order these separately, as they're not included in the standard Rocker Knocker package.