The Poison Spyder Rocker Knockers are even easier to install. Loosen the five body-mount bolts one side at a time. Use a floor jack to hoist up the body and slide the rocker guard in place. The Rocker Knocker catches three body-mount bolts for strength and is made from 3/16-inch laser-plate steel. They come in raw steel, so we had ours powdercoated to match the Trail Corners. An optional slider bar is also available for even more body protection.