22.5 Cu. In. Single gang electrical box for use with nonmeatllic sheathed cable - Molded-in spline device holes, rectangular exterior for easy cut-in - Old work residential construction 2 HR fire resistive walls - PVC - Thermoplastic - Size: D=3 3/4", W=2 3/8", H=3 3/4" - Mount with Metal wing brackets/nonmetal ears wall compression