Drawn metal 4 in octagon box used in the installation of ceiling or wall lighting fixtures or as a junction box. Not designed for ceiling fan support. Maximum recommended support load for a static fixture is 50 lb. TS bracket for wood or metal studs features gauging tabs and recessed nailing spurs. 1-1/2 in depth, 1/2 in bracket setback, three 1/2 in side knockouts, five 1/2 in bottom knockouts. 15.5 cubic inch capacity. Combination screw heads allow for fast cover or fixture installation. Acceptable for use in 2-hour rated walls and ceilings. UL 514-A listed, File E195978.