A tool box adapted to be positioned onto a joist or beam. The tool box has front and rear end walls attached to right and left side walls, and a handle. A tiered passageway extends between the central portions of the front and rear end walls. The tiered passageway includes an upper passageway tier having a first width, a middle passageway tier having a second width, and a lower passageway tier having a third width. Right and left floor portions extend between the bottom edges of the box side walls and the bottom edges of the lower passageway tier. The third width is greater than the second width, and the second width is greater than the first width. The various widths are adapted to fit over joists and beams of varying width.
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