Bestop 75146-15 PowerBoard Electric Retractable Running Board Set for 2011-2016 Chevy Silverado/GMC Sierra 1500/2500/3500 Crew Cab (diesel engine only) Electrically powered running board hides stealthily underneath your truck when doors are closed and extends down to meet your foot when door opens Simplified installation with included wiring harnesses and hardware; for 11-13 Chevy/GMC Silverado/Sierra Crew Cab with diesel engine LED Light Kit can be mounted to linkage or to body and illuminates board and ground below for easier access in and out of your vehiclemore tools Patented high strength, die-cast aluminum linkages built to last in any climate with 600 pounds capacity per side Sturdy 6.25 inch wide aluminum running board features ultra-durable, non-slip, powder-coated surface