Icon Technologies's Skylight Inner Dome for a 25 1/4" x 9 1/2" Skylight opening. Complete your replacement with a new outer dome, NSL2510. • Finishes the look of your skylight with a 1 3/4" white flange • White Inner dome • Easy installation • Made in North America • Fits all standard 25 1/4" x 9 1/2" skylight openings. • Opening Dimension: 25 1/4" x 9 1/2" • Outer Dimension: 28 3/4" x 11 3/4" x 5 1/4" Finish off your replacement with an ICON skylight | Icon Technologies Skylight Inner Dome, for NSL2510 in White