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Underbody tool boxes need solid support directly under the frame rails, and a flimsy bracket will flex or fail under a loaded box. These Buyers Products brackets are fully welded structural steel, built to hold the box rigid instead of letting it sway or sag over rough roads.
They come as a matched left-and-right pair sized 18" tall by 24" deep, with a black powder-coated finish to resist corrosion from road salt and weather. They're compatible with steel, stainless, and aluminum tool boxes - not poly boxes, which need a different mounting approach.
Measure your tool box's height and depth before ordering to make sure these brackets fully support the box underside.