Putco 17-20 Ford SuperDuty - 8ft Bed Boss Locker Side RailsAdd the largest round bed rails in the market to your vehicle with Putco Boss locker truck bed rails. These large truck bed side rails are 2. 5 inches around, which is 43% larger than most other side rails. Constructed out of Putco NeverRust T 304 stainless steel. The rails are polished to match your OE chrome. Every tie down point can handle 1000 lbs. Installing is made easy with no drilling and includes all hardware. This Part Fits: Year Make Model