Feature: 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. Specification: Item Type: Marine Portlight WindowMaterial: 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 Package List: 1 x Marine Portlight Window1 x Fixing Frame Note: 1. The installation is difficult, it is recommended to find a professional engineer to assist in the installation to get the best shopping experience.2. Please pay attention to avoid collision when disassembling and assembling3. Please measure the size before purchasing to make sure it is what you need