Off Roader 2007-2018 Chevy Silverado/GMC Sierra Double Cab/Extended Cab (Nerf Bar | Side Steps) 4" Eboard Running Boards Custom fit, polished aluminum running boards for your Chevy/GMC Silverado/Sierra Double Cab - simple, clean, flat profile design Lightweight yet durable T-6 aircraft grade aluminum body + ridged rubber top with non-slip tread along entire running board 4" wide corrosion resistant, heavy duty running boards (set of 2) - supports 300 lbs on either passenger or driver side Easy to install and no drilling required - all hardware, brackets and instructions included with running boards Brand new, patented, and designed in the USA - we are America's best selling running boards