Wilton Dome - DM9901-90https://www.crownmoldings.net/media/ecom/prodsm/wiltonround-sm.jpgClassic Ceilings Collection Wilton Dome (DM9901-90) -- Dome Dimensions: Dome Outside Diameter: 89-1/4 in., Dome Rough Opening: 84-3/4 in., Dome Opening Depth: 14-3/4 in., Dome Medallion Size: 20 in.Classic-Ceilings-Collection-Wilton-Dome-DM9901-900.00Classic Ceilingsin stockhttps://www.crownmoldings.net/Item/Classic-Ceilings-Collection-Wilton-Dome-DM9901-90