UWS Side Mount Boxes are available in 5 different lengths to fit most size truck beds and toolbox configurations. Tough Insulated Lids* and sturdy leg brackets make these boxes the choice for serious construction and maintenance use. These boxes mount on the bed rail above the wheel well. They match the look and height of the Blue Label Series and have the tough UWS Foam Injected Lid.* The addition of any of the Side mount Series to your truck will not only look right but will handle the tough jobs as professionally as you do.