Icon Technologies's Skylight Inner Dome for a 25 1/2" x 14 1/2" Skylight opening. • Finishes the look of your skylight with a 1 3/8" white flange • Clear Inner dome • Easy installation • Made in North America • Fits all standard 25 1/2" x 14 1/2" skylight openings. • Opening Dimension: 25 1/2" x 14 1/2" • Outer Dimension: 28" x 16 1/2" x 4 1/8" Finish off your replacement with an ICON skylight | Icon Technologies Skylight Inner Dome, for NSL2515 in White