56.5 Cu. In. Three gang electrical box for use with nonmeatllic sheathed cable - Machine tapped device holes, slot provision for low voltage divider, offset gauge marks, leveling ribs, rigid hard box construction, no distortion with high temperatures, shatter resistant with low temperatures - New work residential construction 2 HR fire resistive walls - Fiberglass reinforced polyester - thermoset box - Size: D=3 9/16", W=5 11/16", H=3 3/4" - Mount with Angled mid nails - Speed KlampsÖ factory installed