Lund 26410011 Black Steel Rock Rails for 2007-2018 Silverado/Sierra 1500, 2500HD, 3500HD Extended Cab (Excludes Models with DEF Tank) Patented modular system that offers numerous combinations and configurations Choose from double or single steps that can be quickly removed, while the Rock Rail remains in-place to protect the truck body when hitting the trails Constructed of 3mm thick-walled mild steel for off-road truck protection Fully-welded and integrated bracket system with attractive and durable black wrinkled, powder-coat finish Quick and easy installation and removal of individual step rails