Marine Hatch Porthole Window 17 X 21in Square Heavy Duty Aluminum Alloy Deck Hatch Window with Support Rod and Handle for Yacht RV f26 1Heavy Duty Aluminum Alloy: The frame is made of heavy duty aluminum alloy and has been anodized to polish the surface to a smooth finish, resist to rust and oxidation even in harsh marine or outdoor environments. 2Tempered Glass: The marine deck hatch window is made of thick smoke gray tempered glass to ensure the overall robustness and safety of the window, can filter out UV and ensure that light can enter the cabin, improving the brightness of the cabin, and can also be used for ventilation window. 3Perfect Sealing: The boat push out deck hatch window is equipped with waterproof rubber rings to provide complete sealing and waterproof performance and shock absorption performance when the window is closed. 4Convenient and Flexible: Th boat deck hatch porthole window is made of 316 stainless steel, 0 to 90 degrees can be opened at any angle, and the support is fixed at any angle for flexible use. 5Wide Application: This hatch porthole window is suitable for boat, yacht, ship, and RV, can be used for sunroof, escape window, storage compartment, roof, or any location modification and other projects.