Rv Teardrop Tear Drop Toy Hauler Camper Trailer Windows (1) 30"w X 20" for 1 1/2" Walls Horizontal half vent with a screen and window lock, Includes stainless steel mounting screws Cut Out 30-1/4 x 20-1/4 Outside Measurement 31 1/4 wide x 21-1/4 tall Corner Radius 3-5/16 fits 1 1/2" thick walls