1Oval Design: Marine portlight window is designed with oval eye shape to allow more light to enter the cabin and increase the brightness of the cabin. 2Sealed and Waterproof: Marine hatch porthole window is completely sealed and waterproof, with locking fixed handle, with insect screen and frame. 3Wide Angle Opening: Boat portlight hatch window can be opened at any angle from 0?180 degree, allowing you to enjoy the scenery along the way. 4Wide Application: The oval opening boat portlight window can be used for ventilation window, suitable for small boats, yachts, ships and RVs. 5Durable Material: This oval opening portlight window is made of stainless steel, tempered glass and Abs materials, which have maximum durability. And it is anti aging, and impact resistant.