Specialty Recreation NSL279S Skylight Dome Bri-Rus Skylight Dome Skylights are made of high performance thermoformed polycarbonate to be long lasting and easy to clean When choosing a Skylight, measure your rough hole opening as well as the overall exterior size There is a size to replace most manufacturer's original equipment Smoke color, Hole size 27 inch x 9 inch; flange size 31 Inch x 12 inch; height 5 inch