Silverado Sierra Crew Cab 6" Chrome Oval Factory OE Assist Style Running Boards Step Bars 2007-2014 DOES NOT FIT DIESEL Lifetime Warranty One piece blow molded ABS & Aluminum frame construction, NO rusting! No drilling required. Instructions & all mounting hardware is included Factory style UV resistant, no fading or cracking. Designed to last a Lifetime Rubber molded step grooves for xtreme secure footing Aluminum rail molded in bottom of tube for superior strength. Live help at 716-785-3714.