Feature: 1. Heavy Duty Frame: The frame of the porthole is made of durable aluminum alloy with a polished surface, providing a long lasting resistance againstrust, and oxidation in harsh marine or outdoor environments. 2. Good Sealing: The whole ring of the window frame is equipped with waterproof rubber ring, sealing ring can provide complete sealing waterproof performance and shock absorption effect. 3. Uv Resistant Glass: 10 mm thick smoke gray acrylic glass, durable, can filter out UV while ensuring that light can enter the cabin, improve the brightness of the cabin. 4. Inward Opening: Portholes with inward opening design, double latches locking, open from 0‑180 degree, can be used for portholes, sunroofs, ventilation Windows, storage compartments, or any location. 5. Wide Application: The window adopts 303 x 156mm opening installation, suitable for 5 to 25mm thickness of the wall, can be used to replace your ship yacht RV leaking, broken and unsatisfactory Windows Specification: Item Type: Yacht PortholeMaterial: Aluminum alloy + Nylon + acrylic + rubber Window Size: Approx. 325 x 178mm / 12.8 x 7in Installation Hole Size: Approx. 303 x 156mm / 11.9 x 6.1in Applicable Installation Thickness: Approx. 5-25mm / 0.2-1in Inward Opening Angle: 0-180 degrees Applicable: For Boat/Yacht/Nautical/RV, a solution for your leaking, broken and unsatisfactory Windows . Package List: 1 x Heavy Aluminum Alloy Yacht Porthole1 x Fixed Clamp Frame Note: 1. The installation is slightly more difficult, it is recommended to find professional engineers to assist the installation to obtain the best shopping experience. 2. Please pay attention to avoid collision when disassembling 3. Please measure the size before purchase to make sure it is what you need