Lund 23678357 Black Steel 4" Oval Straight Nerf Bars for 1999-2013 Silverado/Sierra 1500 Extended Cab 4" Oval step with non-slip, flat step pads provides extra-wide stepping area for solid traction and stability Rugged and durable black powder coated steel is corrosion resistant Ultra-smooth finish repels dirt and grime; UV and corrosion-resistant materials Solid construction supports up to 350 pounds Pre-assembled for easy no-drill installation with all mounting hardware included