Feature: 1. Heavy Duty Frame: The frame is made of heavy duty aluminum alloy with an anodized surface that will not be eroded even in harsh offshore links or outdoor environments. 2. Tempered Glass: 6mm thick smoky grey tempered glass (E009335 certified) filters out UV rays while ensuring that light can enter the cabin and increase the brightness of the cabin. 3. Strong Sealing: The frame has a waterproof rubber ring, the sealing waterproof performance is strong, the support rod and hinge are made of 316 stainless steel, corrosion resistance and durability. 4. Window Design: 475x475mm square shape design, can be opened 0‑90 degrees, the support rod is designed with a rotary fixed knob, which can fix any angle support, convenient to enjoy the scenery. 5. Application: Suitable for installation from 3‑23mm wall thickness, suitable for boats, yachts, and motorhomes, can be used for skylights, escape windows, storage boxes, roofs or more. Specification: Item Type: Boat Ventilation Hatch WindowMaterial: Aluminum alloy + tempered glass + ABS + rubber .Opening Method: Push out type, with stainless steel support rod and fixed handle Window Size: Approx. 475x475mm/18.70x18.70inInstallation Opening Size: Approx. 410x410mm/16.14x16.14in, R45-4Suitable Installation Thickness: 3-23mm/0.12-0.91inApplication:Suitable for Boat, Yacht, Nautical, RV, which can be used for your marine yacht RV retrofitting and more, providing a solution for your leaky, broken and unsatisfactory windows Package List: 1 x Boat Ventilation Hatch Window Note: 1. Difficult to install, it is recommended to find a professional engineer to assist the installation to get the best shopping experience,2. Provide sturdy packaging to ensure that the sunroof remains in new condition and is delivered to your hands, please pay attention to avoid collisions when disassembling and assembling3. Please measure the size before purchasing to make sure it is what you need