Perfect Fit: Direct fit for 2007-2013 Silverado Sierra 1500 Crew Cab 2007-2010 Silverado Sierra 2500 3500HD 2011-2014 Silverado Sierra 2500 3500HD (Exc Diesel) Constructed of 4", 5" or 6" oval tubing with 4" wide injection molded polymer step pads Protects vehicle rocker panels from potential damage Steel construction with 30 degree factory style bends at each fully-welded dome end Bolt-on installation and mount kit included - no drilling required on most applications