For convenience outlets, switch boxes or small junction boxes for exposed work applications. 4" x 2", with four 3/4" conduit knockouts (sides), two 3/4" conduit knockouts (bottom) and two 3/4" knockouts (end). 4" height x 2" width x 2-1/8" deep. 16.5 cubic inch capacity. Welded design allows for more working room inside box. UL Listed.