The ICON NSL2610 Skylight Inner Dome is designed to fit a 26-1/2" x 10-1/8" skylight opening, with an angled side measurement of 23-3/8".• Finishes the look of your skylight with a 1-1/4" white flange• Clear inner dome• Easy installation• Fits all standard 26-1/2" x 10-1/8" skylight openings• Opening Dimensions: 26-1/2" x 10-1/8"• Outer Dimensions: 29" x 11-3/4" x 8" Easy installation Fits all standard 26-1/2"" x 10-1/8"" skylight openings with 23-3/8"" angled side | Icon Technologies ICON NSL2610 Skylight Inner Dome in White