Putco 47823 Black Nylon Boss Locker Side RailsSpecifications Brand: Putco Part Number: 47823 UPC: 010536996586 Added the largest bed rails around with Putco Nylon Boss locker truck bed rails. These rails are 2. 5 inches around and are 43% larger than most other rails. Constructed out of our NeverRust T 304 stainless steel with black Nylon ends. The rails are black powder coated to match the black trim of your truck. Each tie down point can handle 125 lbs for up to 500lb tie down capacity.