MAXIMUM TRACTION. Grip Step truck steps have unique expanded metal treads for exceptional traction and safety. These wheel to wheel running boards offer a 7-inch wide stepping surface and extra length at the rear for easier truck bed access CLEANER CAB. The unique tread pattern of these W2W truck side steps also helps keep your truck cab cleaner. Dirt and debris are knocked off your boots as you climb up, and the mess is allowed to pass through the open treads TOUGH FINISH. To maximize corrosion resistance, these aluminum step rails have a highly durable black powder coat finish. This ensures professional-grade protection against rain, snow, dirt and other threats SOLID INSTALLATION. These wheel 2 wheel Grip Step truck step bars fit select model years of the Chevy Silverado 2500 HD or 3500 HD and GMC Sierra 2500 HD or 3500 HD (NOTE: Components ship separately