Boxes, Square, Appleton, Type: 4-11/16" with knockouts, red box option, 2-1/8 Depth Inch, Welded, Volume: 42 Cubic Inch, Side Knockout: 12@ Eccentric KO, Bottom Knockout: 1@1/2", 1@3/4", 2@ Eccentric KO, UL Standard: 514A, UL Listed: E2527, NEMA OS-1