The ICON SL1427 Skylight Inner Dome is designed to fit a 27-1/4" x 13-1/8" skylight opening.• Finishes the look of your skylight with a 1-1/8" white flange• Clear inner dome• Easy installation• Fits all standard 27-1/4" x 13-1/8" skylight openings• Opening Dimensions: 27-1/4" x 13-1/8"• Outer Dimensions: 29-1/2" x 15-3/8" x 3" Easy installation Fits all standard 27-1/4"" x 13-1/8"" skylight openings | Icon Technologies ICON SL1427 Skylight Inner Dome in White