Wilton Dome - DM9901-41https://www.crownmoldings.net/media/ecom/prodsm/wiltonround-sm.jpgClassic Ceilings Collection Wilton Dome (DM9901-41) -- Dome Dimensions: Dome Outside Diameter: 40-1/4 in., Dome Rough Opening: 36-1/2 in., Dome Opening Depth: 7-1/4 in., Dome Medallion Size: 10 in.Classic-Ceilings-Collection-Wilton-Dome-DM9901-410.00Classic Ceilingsin stockhttps://www.crownmoldings.net/Item/Classic-Ceilings-Collection-Wilton-Dome-DM9901-41