Off Roader Eboard Running Board 4" Black Fits 2007-2018 Chevy Silverado/GMC Sierra Crew Cab (Nerf Bar | Side Steps | Side Bars) Custom fit, heavy duty aluminum running boards for your Chevy Silverado/GMC Sierra Crew Cab - simple, clean, flat profile design Lightweight yet durable T-6 aircraft grade aluminum body + black rubberized 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 - all hardware, brackets and instructions included with running boards Brand new, patented, and designed in the USA - eBoard running board is America's best selling running boards