16.0 Cu. In. 4 square inch electrical junction box for use with nonmetallic sheathed cable - Machine tapped cover screw holes, cover screws included, rigid hard box construction, no distortion with high temperatures, shatter resistant with low temperatures - In the wall junction box with optional single and two gang plaster ring covers for junction box capacity and device applications - 2 HR fire resistive walls - Fiberglass reinforced polyester - thermoset box with galvanized steel hanger bracket - Size: D=1 1/4, W=4 1/4, H=4 1/4 - Mount with Stud mount Z hanger bracket offset for flush mount plaster ring - Two metal wire clamps factory installed