28.0 Cu. In. Two gang electrical box for use with nonmeatllic sheathed cable - Machine tapped device holes, rigid hard box construction, no distortion with high temperatures, shatter resistant with low temperatures - Old work residential construction 2 HR fire resistive walls - Fiberglass reinforced polyester - thermoset box - Size: D=2 3/4", W=4 1/8", H=3 1/4" - Mount with Metal wing brackets/metal ears wall compression - Speed Klamps™ factory installed