This eye catching nickel porthole mirror opens just like an actual porthole. It measures 17"Dia. overall and 11.5"Dia. for the mirror itself. We are a retailor and do not deal with the installation process. The manufacturer does not supply any parts with this item. The only item being sold is the porthole mirror 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 & works well in many decor environments.