Rock sliders and/or nerf bars are an important part of body armor protecting your vehicle during off road adventures. When the vehicle is passing over rocks, the rocks slide against the bottom of the rock sliders in between the front and back tires rather than ramming into the underbelly of your vehicle and damaging engine components. They also assist short people in climbing into your lifted vehicle safely. Rock sliders with pre-drilled Hi-Jack holes also play a role in vehicle recovery. Rock sliders are steel bars that are solidly mounted to the vehicle and replace the plastic trim that sits underneath the doors on both sides. 4WD carries rocker protection with mounting holes pre drilled as well as rocker protection with no welding required.