FITMENT: Truck running boards compatible with 2007-2018 Chevy Silverado/Sierra 1500 2500 3500 Double Cab Extended Cab(2 narrow rear doors), 2007-2019 Silverado/Sierra 2500HD 3500HD Double Cab, 2019 Silverado 1500LD/Sierra 1500 Limited Double Cab, not for Crew Cab with 4 full-size doors. Does Not Fit the all diesel engine model or 2007 Silverado 1500 Classic model. MATERIAL: Silverado running boards are made of aluminum with unique powder coating. Aluminum is a stable heavy-duty material that is not easily oxidized by corrosive liquids. The aluminum running boards provide excellent resistance to rust and corrosion in stormy and snowy environments. Powder coated with some glitter for rust prevention while making your running boards look more stylish and outstanding. APPEARANCE: The curvature of the inside of the step bar design makes the truck better match with the running boards. The 6.5-inch running boards with Comnova logo step pads not only provide people with more foot room but also increase the friction between the foot and the step. And making it easier and safer for people to get on and off the truck. The truck step bars with uniquely shaped end caps to prevent impact from protect the vehicle. INNOVATIVE DESIGN: Slider design, able to adjust position on vehicle forward and backward for better installation. EASY TO INSTALL: Just mount it, direct bolt-on, no need to drill. Each step bar can support up to 500 LBS. The package includes two steps(one left and one right), mounting brackets, hardware, and instructions. key words: 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 running boards for silverado double cab chevy silverado running boards silverado 1500 running boards step bars for silverado FITMENT: Truck running boards compatible with 2007-2018 Chevy Silverado/Sierra 1500 2500 3500 Double Cab Extended Cab(2 narrow rear doors), 2007-2019 Silverado/Sierra 2500HD 3500HD Double Cab, 2019 Silverado 1500LD/Sierra 1500 Limited Double Cab, not for Crew Cab with 4 full-size doors. Does Not Fit the all diesel engine model or 2007 Silverado 1500 Classic model. MATERIAL: Silverado running boards are made of aluminum with unique powder coating. Aluminum is a stable heavy-duty material that is not easily oxidized by corrosive liquids. The aluminum running boards provide excellent resistance to rust and corrosion in stormy and snowy environments. Powder coated with some glitter for rust prevention while making your running boards look more stylish and outstanding. INNOVATIVE DESIGN: Slider design, able to adjust position on vehicle forward and backward for better installation. EASY TO INSTALL: Just mount it, direct bolt-on, no need to drill. Each step bar can support up to 500 LBS. The package includes two steps(one left and one right), mounting brackets, hardware, and instructions.