RACO 232 4 in. Square Electrical Box is designed to enclose electrical wiring, switches, receptacles or lighting fixtures. Square box is used where multiple conductor runs are split into two or more directions to bring power to a number of electrical devices inside walls or ceilings for lighting fixtures, switches or receptacles. This durable electrical box is constructed from 1/16 in. pre-galvanized steel and features RACO's patented TKO 1/2-in. & 3/4-in. eccentric knockouts (Per U.L. 514-A, suitable for use without a bonding jumper in circuits above or below 250 volts).Combination cover screw heads provide for faster mudring/cover installation.