General description - This round opening porthole is designed for boats, yachts, RVs, and industrial vehicles. It features a solid ABS molded design that is anti-aging, anti-corrosion, and ultraviolet resistant, ensuring durability and longevity. Technical specifications Thickness of tempered glass: 4mm (0.15 inch) Overall outside diameter: 8 inch (215 mm) Opening diameter with open window: approximately 147 mm Material: Cast and polished 316 stainless steel fittings Corrosion-free synthetic fittings Waterproof and durable rubber seals Installation - The porthole is easy to install with pre-drilled countersunk fixing holes (screws not included). Both fittings can be loosened to allow you to open the porthole. Other information