For solid footing, a comfortable step and a bold look for your truck, ARIES 6" oval side bars are a step up. They are designed to mimic the style of popular original equipment side bars and running boards, featuring two professional finish options, large non-skid step pads and tapered end caps. This particular pair of 6" ovals is made with 304 stainless steel, meaning they are high in nickel content to be truly resistant to rust and corrosion. For a lasting shine and a bright accent on your vehicle, they are given a highly polished, mirror-like finish. They are also available in semi-gloss black powder-coated aluminum. To protect the interior of the tubes, all 6" oval sides are equipped with hard ABS plastic end caps. The end caps come pre-attached to the tubes and feature a tapered design, lending to the overall OE look of the side bars and providing a professional finishing touch on your truck or SUV. For a sure step every time you climb into your vehicle, ARIES 6" ovals are equipped with extra-wide step pads. The step pads are made from tough polypropylene and provide a generous 5" width. The large, flat surface offers comfortable footing and has a textured surface to prevent slipping, even when wet. The polypropylene construction makes the step pads durable and crack-resistant for long-lasting use. ARIES 6" oval side bars are also made for easy, no-drill installation. The boards themselves feature a track system for versatile application, and they mount using vehicle-specific brackets for a custom fit on certain years of the Lincoln Navigator (see application info to verify fitment). The mounting brackets are made from high-strength carbon steel and use pre-existing holes to eliminate drilling during the installation process.