This eye catching brass porthole window opens just like an actual porthole. It measures 8"Dia. overall and 5"Dia. for the window itself. We are a retailor and do not deal with the installation process. The manufacturer does not supply any parts with this item besides the adjustable flange. The only item being sold is the porthole window itself as pictured. It will add a definite nautical touch to whatever room it is placed in and is a must have for those who appreciate high quality nautical decor. It makes a great gift, impressive decoration & will be admired by all those who love the sea.