5" R5™ Series Cab Length Polished Nerf Step Bars (28-51090) by Westin®, 1 Pair. Material: Stainless Steel. Rocker Panel Mount. Step up with Westin’s new R5 Nerf Step Bars! Built with the highest grade corrosion resistant materials, they give your truck the function and stylized look it deserves. Designed and engineered in the USA, our R5 Nerf Step Bars mount directly to your vehicle’s rocker panel and include injection molded bracket covers for a clean, high-end appearance. Get a boost with Westin’s R5 Nerf Step Bars today.