Feature: 1. Aluminum Frame: The whole frame is made of heavy duty aluminum alloy glass with creamy powder coating, polished smooth to ensure oxidation resistance and can be used in harsh marine environment. 2. Sound and Heat Insulation: Clear tempered glass ensures the overall sturdiness and safety of the window, effectively blocking sound and heat to provide a comfortable indoor environment. 3. 180° Maximum Opening Angle: The portlight window is opened by internal pulling and equipped with 304 stainless steel latch for stability, and with a window angle adjuster on the side, 0°‑180° open angle can be selected at will. 4. Weatherproof: The entire frame of the window has a waterproof rubber ring, so that your boat will not be damaged by bad weather, and the outer frame has a rubber seal to ensure that rainwater will not penetrate. 5. Wide Range of Uses: The porthole window can be used in storage compartments, living rooms, lounges or any location where windows are needed to enhance indoor brightness or ventilation. Specification: Item Type: Marine Portlight Window Material: Aluminum alloy+acrylic glass+rubber Window Size: Approx. 400x350mm/15.7x13.8in Installation Thickness: Approx. 40mm/1.57in (there will be a 2mm error for glue fixing), self tapping screws installation (not included), installation hole diameter 6mmInstallation Opening Size: Approx. 350x300mm/13.8x11.8inWindow Angle Adjuster: Adjustable Angle 0°-180°, just tighten the screw into the teeth, can be fixed smoothly Characteristic: Ships, yacht staterooms and low light and non ventilated areas, install windows on yachts to increase light transmission, introduce a wider perspective, enjoy the beautiful scenery of the ocean without moving to the deck. Suitable for use on ships and yachts where windows are needed Application: Suitable for RV, camper, mobile home and any other places where windowsneed to be installed. Package List: 1 x Marine Portlight Window Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. We recommend finding a professional engineer to assist with the installation to ensure a perfect shopping experience.