Buyers Products Diamond Tread Aluminum Backpack Truck Box with Offset Floor features rugged .100 in. thick aluminum construction that will never rust and weighs less than comparable steel boxes without sacrificing strength. The box adds convenient and spacious storage behind the cab, ideal for flatbeds, stake bodies, dump bodies, and utility bodies. Built-in frame mounting rails and an included spring-cushioned mounting kit save time on installation. This backpack truck tool box is built for the long haul with 1/4 in. stainless steel continuous hinges, a rain channel, and a watertight automotive bulb seal to keep your tools secure and protected from weather and grime. Reinforced, locking die cast compression latches provide a tight seal and help deter theft.