Vintage Bronze Opening Porthole - ID: 12 3/8" Long x 5 1/2" Wide - Alden Priscilla 1971Vintage Bronze Opening Porthole. Screens are there but need to be replaced. Do not come with the backing plates. DO come with the chain latch that holes it open. Inside diameter (area that you mount into the boat) is 12 3 8" long x 5 1 2" wide x 1 1 4" deep. The outside diameter measures 14 1 2" x 7 1 2". Off of an Alden Priscilla 1971, Picture of Boat included.