Dry Boxes by Cambridge Welding are manufactured from .090 thick aluminum sheets, have smooth Heli-arc welded ends.
Lids are shoe-box style with continuous steel hinge, supported in the center with a nylon strap, and with butterfly cam latches. Folding rubber spring loaded handles are attached at each end.
Cambridge Welding has set the standards of box building since 1985. All else just try keep up downstream.