Fits to the Toyota 4runner's 8 existing mounting points in the rear. Drilling is required to secure the front of the rails. (see fitting instructions for details) Foot rails follow the contours of the vehicle's roof line providing off-road tough strength to support a Front Runner Rack. These Foot Rails contain 2 openings to access Front Runner under rack mount tables (1 smaller TBRA018 and 1 larger TBRA017). Made of high strength steel and sealed with the same durable, weather resistant powder coating as the Front Runner Rack. Installation hardware and fitting instructions included. Please Note: Installation of this product requires a Rivnut tool. We suggest using the VACC016.