Four 1/2 in conduit knockouts (sides). Four 1/2 in conduit knockouts (bottom). #bracket. Used in the installation of ceiling or wall lighting fixtures or as a junction box. 1-1/2 in deep, 15.5 cu-in capacity. Not designed for ceiling fan support. 50 lb maximum recommended static load. Acceptable for use in 2 hrs fire rated walls. UL listed. UPC bar code.