Vintage Technologies Rv Teardrop Cargo Toy Hauler Horse Trailer Camper Windows (1) New 20" X 30" for 1 1/2" Walls Vertical half vent with a screen and window lock, Includes stainless steel mounting screws Cut Out 20-1/4 Wide x 30-1/4 Tall Outside Measurement 21 1/4 wide x 31-1/4 tall Corner Radius 3-5/16 For 1 1/2" thick walls