Westin E-Series Nerf Bars are made of 3 inch diameter round tubing and are custom fit for your vehicle. The step design and mounting method varies slightly by application but all sets come with a mounting kit and hardware. The bars are available in polished stainless or black powder coat finishes to make sure you get the look you want. Bolt-on installation so no drilling is required. Westin backs the stainless bars with a lifetime warranty and the black powder coats with a 3-year warranty.