Icon Technologies's Skylight Inner Dome for a 24" x 13 1/2" Skylight opening. Complete your replacement with a new outer dome, NSL2414. • Finishes the look of your skylight with a 1 1/8" white flange • Clear Inner dome • Easy installation • Made in North America • Fits all standard 24" x 13 1/2" skylight openings. • Opening Dimension: 24" x 13 1/2" • Outer Dimension: 26 1/2" x 15 7/8" x 2" Finish off your replacement with an ICON skylight | Icon Technologies Skylight Inner Dome, for NSL2414 in White