A bracket has a base or back that can be attached to a support, and spaced-apart, substantially vertical projections or flanges extend out from the back. The flanges are load-bearing and spaced apart to leave two side-by-side U-shaped recesses of unequal width. The recess of greater width is dimensioned to receive the two flanges that define the recess of lesser width when an identical and second bracket is positioned opposite the first and the flanges of the two brackets interfitted. Thus, a bracket pair is formed with their wide and narrow recesses being interfitted. At the bottom of the narrow recess, a captured nut on an apertured tab is positioned to receive a threaded screw or bolt from above. A strip with holes bridges the upper edges of the flanges of both brackets of the pair and screws can be passed through the holes between the flanges to engage the nuts at the lower ends of the narrow recesses.