Authentic aluminum portholes have many uses in coastal home decorating. They can be hung on the wall or you can add a mirror for a beautiful and functional addition to your nautical decor. On a ship, the function of a porthole is to let in light and fresh air and when closed, protect against the high seas. Our authentic portholes will add a authentic nautical touch to any room and are a must have for those who appreciate high quality nautical decor. They make great gifts, impressive decorations and will be admired by all who love the sea.