Lund 34641173 Black Steel Terrain HX Step Nerf Bars for 2015-2018 Chevrolet Silverado/GMC Sierra 2500HD/3500HD Extended Cab Constructed from 3" diameter, 3mm thick heavy duty steel tubing with an attractive and durable black powered coated wrinkle textured finish Hoop steps are securely welded to the main tube and offer a 4" drop for easier cab entry and exit Includes a steel non-slip skid plate on each hoop step Easy no-drill installation 3-Year Limited Warranty