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 Round Nerf Step Bars; Single Step Pad; Polished Stainless Steel; Mount Kit Included; 3 in. Round Tube 1999-2013 Chevrolet Silverado 1500 Standard Cab Pickup, 2007 Chevrolet Silverado 1500 Classic Standard Cab Pickup, 1999-2004 Chevrolet Silverado 2500 Standard Cab Pickup, 2001-2014 Chevrolet Silverado 2500 HD Standard Cab Pickup, 2007 Chevrolet Silverado 2500 HD Classic Standard Cab Pickup, 2001-2010 Chevrolet Silverado 3500 Standard Cab Pickup, 2007 Chevrolet Silverado 3500 Classic Standard Cab Pickup, 1999-2013 GMC Sierra 1500 Standard Cab Pickup, 2007 GMC Sierra 1500 Classic Standard Cab Pickup, 1999-2004 GMC Sierra 2500 Standard Cab Pickup, 2001-2014 GMC Sierra 2500 HD Standard Cab Pickup, 2007 GMC Sierra 2500 HD Classic Standard Cab Pickup, 2001-2006 GMC Sierra 3500 Standard Cab Pickup, 2007 GMC Sierra 3500 Classic Standard Cab Pickup