Four cable pryouts and one - 1/2" KO side; one - 1/2" KO bottom. Octagon boxes are used in the installation of ceiling or wall light fixtures. TS bracket features gauging tabs and recessed nailing spurs, for wood or metal studs. Acceptable for use in 2-hour fire rated walls and ceilings. 1-1/2" deep - 15.5 cubic inches. UL Listed.