Feature: 1. Oval 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. 2. Sealed and Waterproof: Marine hatch porthole window is completely sealed and waterproof, with locking fixed handle. 3. Wide 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. 4. Wide Application: The oval opening boat portlight window can be used for ventilation window, suitable for small boats, yachts, ships and RVs. 5. Durable 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. Specification: Item Type: Oval Opening Portlight WindowMaterial: Stainless steel, tempered glass, ABS Window Dimension: Approx. 470 x 210mm / 18.5 x 8.3in Installation Cut Out Size: Approx. 405 x 150mm / 15.9 x 5.9in Suitable Thickness: 10‑40mm / 0.39-1.57inApplication: Transparent window can increase cabin brightness, can be used to change the window, completely sealed waterproof, with locking fixed handleFitment:Applicable for Boat, Yacht, Ship, RV. Package List: 1 x Oval Opening Portlight Window1 x Fixed Outer Frame Note: You are advised to seek professional engineers to assist in the installation.