Westin(TM) E-Series Nerf Bars are made of 3in. diameter round tubing and are vehicle specific designs. Step design and mounting technique varies by application (mounting kit included). They feature recessed area mounted step pads unique to E-Series Nerf Bars feature the Westin(TM) brand name and are UV resistant. E-Series 3 in. Round Step Bar Cab Length; Polished Stainless Steel; Mount Kit Included; Rocker Mount; F-150 Reg Cab 2015-2018; F-250/350 Super Duty Reg Cab 2017-2018