1、Heavy Duty Porthole: Using anodized aluminum hatch frame, stainless steel support bar, rubber sealing strip, tempered glass, anti aging, anti UV, seawater resistance. 2、Wide View: 625mm push out round design provides wide field of view, with on off locking handle and support bar that allows you to fix the hatch cover in different positions. 3、Weatherproof: Boat opening window is designed for use in the ‑40℃ to +60℃ temperature range and can be used in a variety of harsh climatic conditions. 4、Anthracite Tempered Glass: Equipped with a 0.24in (6mm) thick tempered anthracite glass top and durable hinges, fully sealed against water. 5、Wide Application: This round porthole can be widely used for Boat, Yacht, Nautical, RV. Also a good wall decor for any nautical or pirate theme.