4 inch Premier Polished Oval Tube Step Bars by Westin. Body Frame Mount. The 4 inch oval tube nerf step bars are mounted using a cradle technique. Oval Tube nerf bars are of straight step style design and are made of tube that is 4 inch at its widest dimension. Features. Roadtough 4 inch oval tube. Wearresistant injection molded step pads. Molded oval end caps. Cradle mounted tubesCompatibility. 20022013 Chevy Avalanche. 20012018 Chevy Silverado 1500. 20012019 Chevy Silverado 2500. 20072019 Chevy Silverado 3500. 20052013 Chevy Suburban. 20072014 Ford Expedition. 20092020 Ford F150. 19992022 Ford F250. 19992022 Ford F350. 20082020 Ford F450Specifications. Color Chrome. Finish Polished. Material Stainless Steel. Shape Oval. Step Width 4. Weight 40 lbs