Specialty Recreation Sr SL1626S Skylight Exterior 16X26 Smoked 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 Rectangular Skylight, Smoke color Hole size 16 inch x 26 inch; flange size 20 Inch x 30 Inch; height 4.5 inch