4 X 12 Inch American Walnut Wood Flush Mount Flooring Register Vent Cover Grille by WELLAND, 3/4" in Thickness Fits a duct size opening of 4" x 12", Overall dimension is 14.45" x 6.75" x 0.75" Made of Unfinished Solid Grade A Maple Wood Louvered Design with Metal Damper Installed Flush-mount vent sits flush with 3/4" hardwood floor Metal damper allows airflow to be switched on and off Made of 3 parts ,Easy to install Solid Grade A Maple Wood Louvered Design with Metal Damper Installed Flush-mount vent sits flush with 3/4&#034; hardwood floor Metal damper allows airflow to be switched on and off Fits a duct size opening of 4&#034; x 12&#034; Overall dimension is 14.45&#034; x 6.75&#034; x 0.75&#034; Measure the size of the duct opening. Do not measure your current floor register. Fits a duct size opening of: 4&#034; x 12&#034; you must measure the size of the duct opening