Outside diameter: 10 1/8" - Inside/Cut out diameter: 8 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. 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.