Vintage Technologies WD18 RV Teardrop Trailer Windows (1) 24"x15" Configuration:Horizontal half vent with a screen and window lock, Includes stainless steel mounting screws Cut Out 24-1/8" x 15-3/16 Outside Measurement 25-1/8 wide x 16-1/4 tall Corner Radius 3-5/16 Wall Thickness: Sold with  trim ring for a  wall