Feature: 1. FINE WORKMANSHIP: Using engineering grade ABS frame, stainless steel support bar, rubber sealing strip, tempered glass, anti aging, anti UV, deformation resistance and yellowing resistance, long lasting. 2. 180° OPEN ANGLE: The push window can be opened at any angle from 0‑180 degrees, and the stainless steel support rod with rotating fixed knob can be fixed at any angle to support, enjoy the scenery along the way. 3. MULTIPURPOSE: The porthole is sealed with rubber strips on all sides, waterproof when the window is closed, and can be used for skylight, escape window, storage compartment, roof, or any position. 4. CLEAR GLASS: 565x565mm square design, clear tempered glass allows more light to enter, enhancing the interior brightness, and can also be used as a ventilation window. 5. WIDE APPLICATION: This square porthole can be widely used for Boat, Yacht, Nautical, RV. Also a good wall decor for any nautical or pirate theme. Specification: Item Type: Boat Opening Window Material: ABS + tempered glass + stainless steel + nylon Window Size: Approx. 620x640mm/24.4x25.2in Installation Opening Size: Approx. 565x565mm/22.2x22.2in (Please allow 3mm measurement error, please refer to the window profile size) Suitable for Installation Thickness: Approx. 23mm-50mm/0.9-2in, or any thickness Applicable: Fit for Boat, Yacht, Nautical, RV. Package List: 1 x Boat Porthole1 x Fixing Frame Note: Installation work is a little more difficult, if you are not a professional, we recommend finding a professional engineer to assist in the installation to get the best shopping experience