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; Dual Step Pad; Polished Stainless Steel; Mount Kit Included; Silverado/Sierra 1500 Ext. Cab 1999-2014; 2500LD Ext. Cab 1999-2004; 2500/3500HD Ext. Cab 2001-2014