UWS originated this Rail Collection with a stylish look, using strong aluminum tube rails using strong alloy extrusions welded to the UWS unique Structural Foam Lid.* No rivets or screws are used to attach the extrusions to the lid, which can leak through the lid. UWS Rail Series is the perfect upgrade for someone wanting to add a "Touch of Class", in a practical way. Perfect for securing baggage, coolers and other cargo, yet lends an attractive and distinctive "coach-like" appearance to your truck.