Feature: 1. Opening Angle: Square design of the portlight can be opened at any angle from 0‑90 degrees, stainless steel support bar with rotating fixed knob for fixed support, convenient for you to enjoy the scenery and escape. 2. UV Proof: The glass filters out UV rays while ensuring that light can enter the compartment, enhancing the brightness of the cabin, and can also be used for ventilation windows. 3. Anti Oxidation: The frame of the portlight is made of heavy duty aluminum alloy, which ensures oxidation resistance and will not be damaged even in harsh marine or outdoor environments. 4. Anodized Surface: The anodized boat porthole window surface is polished to a smooth finish to provide a comfortable touch, suitable for boat, yacht, RV, etc. 5. High Strength: 6 mm thick tempered glass, strong and safe, the support bar and hinges are made of 316 stainless steel to ensure the overall pressure resistance and durability of the porthole. Specification: Item Type: Boat Porthole WindowMaterial: Aluminum alloy, tempered glass, ABS, rubberSwitching Method: External push type, with stainless steel support rod and fixed handleWindow Size: Approx: 575x575mm/22.63x22.63in Installation Hole Size: Approx: 510x510mm/20.07x20.07in Suitable for Installation Thickness: Approx: 33-55mm/1.3-2.16in Application: Suitable for boat, yacht, marine, RV, a solution for your leaking, broken, and dissatisfying windows . Package List: 1 x Boat Porthole Window Note: 1. Installation is slightly difficult, it is recommended to find a professional engineer to assist in the installation of the best shopping experience.2. Please pay attention to avoid collision when disassembling and assembling.3. Please measure the size before you buy to ensure that it is what you need.