Description: Material: Solid aluminum glass Finish: Aluminum shinny finish Size: 12 inch diameter Glass Size: 8 inch diameter Weight: 1.7 lbs This ship's porthole window would make a great addition to your nautical wall decor. This nautical solid aluminum Porthole Glass Window has a round diameter of 12" and is 2.5" deep. The window is approx. 8" in diameter. The porthole window has 2 dogs (latches) that can be loosened to allow you to swing open the porthole. Mounting screw holes are located hidden behind the opening window port section. The window frame has realistic rivets and an aluminum finish (finish and minor blemishes may be varied). A porthole is a small, generally circular, window used on the hull of ships to admit light and air. Porthole is actually an abbreviated term for "port hole window". Though the term is of obvious maritime origin, it is also used to describe round windows on armored vehicles, aircraft, automobiles (the Ford Thunderbird a notable example), and even spacecraft. On a ship, the function of a porthole, when open, is to permit light and fresh air to enter the dark and often damp below-deck quarters of the vessel. It also affords below-deck occupants a limited, but often much needed view to the outside world. When closed, the porthole provides a strong water-tight, weather-tight, and sometimes light-tight barrier.