10 inch porthole round opening porthole - 4 mm (0.15 in) thick tempered glass - Overall OD: 10.4" / 265 mm - Simple "click" build - Cast and polished 316 stainless steel fittings - Sturdy ABS molded design, anti-aging, anti-corrosion, anti-ultraviolet. Round portholes for boats, yachts, caravans, and industrial vehicles - Corrosion-resistant synthetic fittings and waterproof, durable rubber seals - Tempered glass for strength, clarity, and chemical resistance - Both fittings can be unscrewed to allow opening of the porthole - Easy to install with pre-drilled countersunk mounting holes (screws not included) - Window opening diameter: approx. 7.75 in / 197 mm. Includes: 1 x Porthole Note: The actual color of the item may be slightly different from the pictures shown on the website due to various factors such as monitor brightness and lighting conditions. There may be slight deviations in measurement data. Due to manual measurement, please allow 1 cm to 2 cm error.