Feature: 1. Robust Construction: The overall frame of the porthole is made of heavy duty aluminum alloy, and the anodized surface is polished to smooth, ensuring rust resistance and oxidation resistance for a long time. 2. Acrylic Glass: The light transmitting part of the window is made of acrylic glass with a thickness of 10mm, which can filter out ultraviolet rays and ensure that light can enter, improving the brightness of the cabin. 3. Waterproof Design: The whole frame of the window is equipped with rubber ring, and the sealing ring can provide complete sealing waterproof performance and shock absorption effect. 4. Flexible Opening: Porthole adopts internal opening design, double lock fixed, used for 0‑180 degree angle opening, and can be used for porthole, skylight, ventilation window, storage compartment, or any position. 5. Widely Use: 347x 171mm open hole installation comes with aluminum alloy fixing clip frame, suitable for 5‑25mm thick walls, ideal for boats, yachts, ships, and RVs, providing a solution for your leaking, broken windows. Specification: Item Type: Boat Porthole WindowMaterial: Aluminum alloy, Nylon, Acrylic, rubberWindow Size: Approx. 369x193mm/14.52x7.6inMounting Hole Size: Approx. 347x171mm/13.66x6.73in Applicable Installation Thickness: Approx. 5-25mm/0.2-1inInternal Opening Angle: 0-180 degrees Applicable: Suitable for Boat, Yacht, Nautical, RV . Package List: 1 x Window1 x Fixed Clamp Frame 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.