The heavy duty brass porthole window is an exact replica of a ship's porthole. It is the perfect alternative for people who want an authentic porthole without paying the huge price. Contractors buy these portholes from us all the time & they install them in homes & businesses. We are a retailor & do not deal with the installation process. The manufacturer does not supply any parts with this item. It does however come with a rubber gasket around the tempered glass window to make sure the window is properly sealed. The only item being sold is the porthole window itself as pictured. We recommend professional installation of this item. It measures 21"Dia. overall and 15.5"Dia. for the window itself. It weighs about 34lbs. The glass on the window is 1/2" thick.