Abstract: A tool storage device is disclosed including a cabinet having a plurality of vertically arranged planar side walls each containing a plurality of apertures adapted to receive a portion of a support hook. The cabinet is characterized by an internal assembly for locking the hook portions within the apertures to provide stable support for hand tools and the like. The locking assembly includes a plurality of locking plates arranged parallel to and spaced from the cabinet side walls, respectively, and a rotatable cam for displacing the locking plates relative to the side walls between locked positions in which the locking plates press the hook portions against the inner surfaces of the associated side walls, respectively, and unlocked positions in which the locking plates release the hook portions, respectively.