Trim Ring - Black Powder Coat - For Four Gang Ultra-Shallow Recessed Service Floor Box - 192 Cubic Inches for Device Access and 41/55 Cubic Inches for Device Compartments - Length 13-1/4 Inches - Width 15-1/4 Inches - Depth 2-1/2 Inches - 3/4 Inch Knockouts - Galvanized Steel - Provides High Capacity Power and Data Solution for Shallow Concrete Floors.