Feature: 1. Aluminum Alloy Construction: The window is constructed with heavy duty aluminum alloy. The surface is treated with anodization, providing a smooth and oxidation resistant finish that remains gloss even in harsh marine or outdoor environments. 2. Acrylic Glass: The window feature 6mm thick, smoke gray acrylic glass that offers excellent transparency. Equipped with rotating fixed handles and 316 stainless steel support rods, ensuring the overall strength and durability of the windows. 3. Waterproof Sealed: Each window frame is equipped with a waterproof ring, providing complete sealing and waterproof performance . The smoke gray glass filters out UV rays while allowing light to enter, enhancing the brightness of the cabin. 4. Versatile Opening: Adopts push out opening design and feature a rotating handle with a lock button, which can be opened at any angle from 0 to 90 degrees, suitable for use as skylights, ventilation windows, storage compartments, or even on the roof. 5. Perfect Application: 500x500mm opening size and can be installed on walls with a thickness of 15mm or any other thickness. Ideal for boat, yacht, ship, and RV applications, providing a solution for old, damaged, or unsatisfactory windows. Specification: Item Type: Boat Porthole WindowMaterial: Aluminum alloy, Nylon, Acrylic, 316 stainless steelWindow Size: Approx. 570x565mm/22.44x22.24inMounting Hole Size: Approx. 500x500mm/19.68x19.68in Applicable Installation Thickness: Approx. 15mm/0.59in, or any thicknessPush Out Opening Angle: 0-90 degrees Applicable: Suitable for Boat, Yacht, Nautical, RV . Package List: 1 x Window Note: 1. Installation is difficult, it is recommended to find professional engineers to assist in installation to get the best shopping experience.2. Please pay attention to avoid collision when disassembling and assembling.3. Please measure the size before purchasing to make sure it is what you need.