FOUR-INCH-SQUARE BOX
Description: As its name implies, this is a box 4 inches on a side, usually only 1 1/2 inches deep, but also found in a 2 1/8-inch depth.
Buying information: When the wall cavity is too shallow to accept a 2 1/2-inch-deep gem box, use a 4-inch square box. While shallow enough to fit into the wall, it has the same cubic capacity as a gem box.
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