Feature: 1. Durable and Rust Resistant: The overall frame of the escape window is made of heavy aluminum alloy and has been anodized to a smooth surface to provide a good touch and will not rust even in harsh Marine or outdoor environments. 2. Thickened and UV Resistant Tempered Glass: 6 mm thick smoky grey tempered glass countertops ensure the overall robustness and security of the Windows. The smoke gray glass can filter out ultraviolet rays and ensure that the light can enter the cabin, improving the brightness of the cabin. 3. Excellent Sealing Performance: The whole ring of the window frame is equipped with waterproof rubber ring, which ensures complete sealing and waterproof performance when the window is closed. 4. Push out Type in 90 Degree: Porthole has an push out type opening with switch lock handle and fixed support rod, pushing window can be used for 0 to 90 degree, support rod with rotating fixed knob, fixed support function is convenient to enjoy the scenery along the way. 5. Wide Application: Suitable for boat, yacht, ship, and RV, and can be used for sunroof, escape window, storage compartment or any location. A solution for your boat yacht RV retrofitting and other projects, for your leakage, broken and unsatisfactory windows. Specification: Item Type: Boat Square Porthole Material: Aluminum alloy + toughened glass +ABS+ rubber Switching Mode: Push out type, with stainless steel support rod and fixed handle Window Size: Approx. 425 x 425mm / 16.7 x 16.7in Installation Opening Size: Approx. 360 x 360mm / 14.2 x 14.2in, R45-4 Suitable Installation Size: Approx.33 - 55mm / 1.3 - 2.2in Applicable: For Boat/Yacht/Nautical/RV, it's the nautical /RV solution for leaking, broken, and dissatisfying Windows. Package List: 1 x Boat Square Porthole Window Note: 1. The installation is somewhat difficult, so it is recommended to find professional engineers to assist in the installation to obtain the best shopping experience.2. Strong packaging is provided to ensure that the skylight is delivered to you in a new state. Please pay attention to avoid collision when disassembling and assembling3. Please measure the size before purchase to make sure it is what you need