Hopkins Dome - 98590https://www.crownmoldings.net/media/ecom/prodsm/98590-sm.jpgFocal Point Hopkins Dome (98590) -- Ceiling Dome Dimensions: Ceiling Dome Inside Diameter: 21 in., Ceiling Dome Outside Diameter: 27 in., Ceiling Dome Rough Opening: 24-1/4 in., Ceiling Dome Opening Depth: 3-7/8 in., Ceiling Dome Interior Depth: 3-1/4 in.Focal-Point-Hopkins-Dome-9859095.25Classic Ceilingsin stockhttps://www.crownmoldings.net/Item/Focal-Point-Hopkins-Dome-98590