1、Robust Construction: Made of heavy duty aluminum alloy, the frame of is smooth and corrosion resistant, ensuring long lasting performance even in harsh marine or outdoor environments. 2、Durable and Transparent: The translucent window glass part is made of 10mm thick smoke gray acrylic glass, providing durability and transparency to the entire window. 3、Waterproof: The window frame features a waterproof seal ring, providing complete waterproof with shock absorption. The gray glass filters out UV rays while allowing light to enter. 4、Versatile Design: The internal opening with double locking clasps allows for opening at angles between 0‑180 degrees, making it suitable for portlights, skylights, vent windows, storage compartments and more. 5、Easy Installation: Suitable for walls thickness of 5‑25mm, applicable for boat, yacht, ship, and RV, ideal for leaking, damaged, or unsatisfactory windows in your vessel or recreational vehicle. Item Type: Marine Portlight Window Material: Aluminum alloy + Nylon + acrylic + rubber Front Size: Approx. 451x193mm/17.76x7.60in Mounting Cut Out Size: Approx. 429x171mm/ 16.89x6.73in Applicable Wall Thickness: Approx. 5-25mm/ 0.20-0.98in Inner Opening Angle: 0-180 degrees Application: Applicable for Boat, Yacht, Nautical, RV 1 x Marine Portlight Window 1 x Fixing Frame