22.5 Cu. In. single gang electrical box for use with nonmeatllic sheathed cable - Machine tapped device holes, leveling ribs, rigid hard box construction, no distortion with high temperatures, shatter resistant with low temperatures - New work residential construction stud face mounted 2 HR fire resistive walls & ceilings - Fiberglass reinforced polyester - thermoset box with galvanized steel bracket - Size: D=3 9/16", W=2 1/4", H=3 3/4" - Mounted with Stud mount "Z" hanger bracket with 1/2" offset