Aluminum Chrome Finish Ships Porthole Mirror 20" AL486110M Nautical Wall Decor Aluminum Chrome Finish Ships Porthole Mirror 20" This nautical solid aluminum porthole mirror has a round diameter of 20" and is 3.5" deep. The Porthole mirror 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 mirror port section. This ship's porthole mirror would make a great addition to your nautical wall decor Chrome finish Size: 20" diameter Mirror size: Approx. 13.75" diameter