Welded square steel box, no bracket, installed in ceilings or walls for lighting fixtures, switches or receptacles, used where multiple conductor runs are split into two or more directions to bring power to a number of electrical devices. TKO 1/2 in and 3/4 in eccentric knockouts (Per U.L. 514-A, suitable for use without a bonding jumper in circuits above or below 250 volts). Eight 1/2 in and 4, TKO side knockouts, three 1/2 in and 2 TKO bottom knockouts. Combination cover screw heads provide for faster mud ring/cover installation. UL 514-A listed, File E195978. 21.0 cubic inch capacity. Acceptable for use in 2-hour rated walls.