Nerf Step Bar Wheel-to-Wheel with Bed Access (3 Steps per Side) 2017-2019 Chevy Silverado/GMC Sierra 2500 HD/3500 HD 8 Foot Bed Crew Cab with Single Rear Wheels Textured Black Works with DEF Tank NFabN FAB takes innovation to a new level with AdjustSTEP adjustable height Nerf Steps. Built around N FAB's patented mounting system and 3 inch. wheel to wheel main tube assembly, AdjustSTEP features Vertically Variable Step (VVS) technology, allowing for up to 5. 5 inch. of vertical height adjustment at each step. This technology makes AdjustSTEP ideal for any vehicle, whether stock or lifted. AdjustSTEP Nerf Steps come equipped with steps for each