Ceiling box. 4 in. (H) x 3 3/4 in. (W) x 2 3/4 in. (D). Made of plastic. Loomex clamps. Positioning tabs eliminate the need to measure for 1/2-in. drywall installation. 4 hinged cable entry tabs. Easy access to bottom-mounted ground screw. Internal screw slots for all devices. 2-hour fire rating. Grey.