Commercial PRO HD Aluminum Cross Bed Boxes Constructed with heavy-duty .080 Aluminum reinforced by expert craftsman hand TIG welded seams; Commercial PRO HD boxes keep equipment safe and dry. The reinforced and insulated high dome lid featuring an ultra-tight weather proof bulb seal and adjustable J-bolt striker mount is bolted to the box body with a heavy duty aluminum piano-style hinge for unequaled strength and durability - even in the coldest weather.&