Truaire C104M 08X08(Duct Opening Measurements) 4-Way Supply 8-Inch by 8-Inch Sidewall or Ceiling Register Grille, White Smoothglide damper Model Size Indicates Duct Opening Measurements not Wall Opening Measurements. High quality steel components , no plastic High quality powder coated The actual face size is 9.75-inch in width and 9.75-inch in height.