16"x 16"Stamped Face Steel Return Grille Vent Cover White Poweder Coating Without Frame Outside Dimension 17.75"x17.75" Actual outside overall dimensions is

Actual outside overall dimensions is 9

Distance between the centers of two screws is 14

If you measure outside or surface size

The Listed size 24"x10" is for inside duct opening measurement

Built in magnets on each side for easy installation

16"x 16"Stamped Face Steel Return Grille Vent Cover White Poweder Coating Without Frame Outside Dimension 17.75"x17.75" Actual outside overall dimensions isThe Listed size 16"x 16" is for inside duct opening measurement, actual outside dimension is 17. 75"x17. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow Screws are included for easy installation White Powder coating with matte finish