N-FAB C1573QC Gloss Black Nerf Step; Cab Length Chevy-GMC 2500 / 3500 (15-16 Diesel Model) Double Cab All Beds 15-18 Trend-setting hoop step design provides ease of access for all passengers on stock or lifted vehicles Heavy gauge 3" main tube fit tight to the body for a clean modern look. Fully welded assembly with integrated mounting brackets, for maximum strength and ease of installation Dimpled step plate allows superior Traction and stability in any weather condition Cab length configuration main bar runs from back of front wheel well to back of Cab