Icon Technologies's Skylight Inner Dome for a 19 1/2" x 7 1/2" Skylight opening. Complete your replacement with a new outer dome, NSL208. • Finishes the look of your skylight with a 1" white flange • White Inner dome • Easy installation • Made in North America• Fits all standard 19 1/2" x 7 1/2" skylight openings. • Opening Dimension: 19 1/2" x7 1/2" • Outer Dimension: 21 1/2" x 8 1/2" x 4 3/4" Finish off your replacement with an ICON skylight | Icon Technologies Skylight Inner Dome, for NSL208, White