RKI Chest Truck Tool Box M-Series White Steel Model M60-1RKI Chest Truck Tool Box M Series White Steel Model M60 1 Hull of the box is constructed of 14 gauge cold rolled steel Bottom of the box is constructed of 14 gauge cold rolled steel, and fully welded on all 4 sides. Lid is constructed of 14 gauge cold rolled steel with a 14 gauge cold rolled steel inner stiffener. 10 gauge mounting brackets 15 1 2" x 4 1 2" welded to each end of the box Welds are full arc welds, no spot welds Full size stainless steel