10 inch porthole round opening porthole- 4 mm (0.15 in) thick tempered glass- Overall OD: 10.4"/265mm- Simple "click" build- Cast and polished 316 stainless steel fittings- Sturdy ABS molded design, anti-aging, anti-corrosion, anti-ultraviolet.Specification:- Round portholes for boats/yachts/caravans/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 you to open the porthole- Easy to install, pre-drilled countersunk mounting holes (screws not included)- Window opening diameter: approx. 7 3/4 in / 197 mmequipment:Porthole 1notes:1. The actual color of the item may be slightly different from the pictures shown on the websiteCaused by various factors, such as the brightness of the monitor and the brightness of the light.2. There may be slight deviations in the measurement data.3. Due to manual measurement, please allow 1cm-2cm error.