1、Sturdy Structure: The overall frame is made of aluminum alloy, with a polished surface, ensuring the overall durability of the porthole, which can be used in harsh maritime or outdoor environments for a long time. 2、10mm Acrylic Glass: The transparent part of this portlight window is made of 10mm thick smoky grey acrylic glass to ensure the overall robustness and durability of the skylight. 3、UV Resistant: The smoke gray glass filters out ultraviolet rays and ensures that light can enter the cabin, improving the brightness of the cabin, and can also be used for ventilation. 4、180° Internal Opening: Supports a 0‑180 degree opening angle, the window can be fixed at any angle, allowing you to enjoy the scenery along the way. Can be used for skylights, storage compartments. 5、Wide Applications: The porthole is suitable for installation with a thickness of 5‑25mm, perfect for boats, yachts, ships, and RVs. It provides a solution for your leaking, damaged, and unsatisfactory windows. Item Type: Boat Porthole Window Material: Aluminum alloy + Nylon + acrylic + rubber Window External Size: Approx. 367 x 197mm / 14.45 x 7.76in Installation Hole Size: Approx. 345 x 175mm / 13.58 x 6.89in Suitable For Installation Thickness: Approx. 5-25mm / 0.2-0.98in Inside Opening Angle: 0-180 Degrees Application: Suitable for Boat, Yacht, Nautical, RV 1 x Boat Porthole Window 1 x Fixing Frame