Outside diameter: 8 2/16" - Inside/Cut out diameter: 6 3/4" Pry out lid for quick access, can also be tethered to case using a wire lid stay also available Water tight o-ring seal and grooved flange bottom for bedding compound retention. UV resistant plastic. Quick and simple installation. Ideal for marine/yacht applications e.g deck plates and hatches, running power cords through the back of racks or as a vent port. High quality part that is made in the USA PLEASE NOTE: We do NOT include screws for mounting. We recommend #8 or Euro M6 round head screws. Our weather-tight marine deck plates feature a secure pry-out center, with o-ring seal and grooved flange bottom for bedding compound retention. Perfect for use on your boat where hose or electrical connections require frequent access.