Size: Outer Diameter- 24 inches, Glass Diameter- 17 inches approx. It’s perfect for people who decorate their homes with a nautical item. Working Porthole Open and Close. It has holes for wall mounting. Excellent Hinged Wall Décor for any Nautical or Pirate Theme. A Porthole, sometimes called bull’s-eye window, is a generally circular window used on. Though the term is of maritime origin, it. Is also used to describe round windows on armored vehicles, aircraft, automobiles and. Look Photos For Actual Image Of Product. All Work is Handmade. Good Piece Of Collection.