Hatches are easy to install, and mount vertically or horizontally (invisible fasteners when cover is closed). 180 degrees opening, weather tight seal, reinforced with textured non-skid surface. UV resistant. 1/2" Closed height. ID 10-1/2" x 20-3/8" OD 14" x 24" Cut Out 11-1/8" x 20-7/8" Color White