Round opening porthole for 10 inch porthole Description: - 4mm (0.15 inch) thick tempered glass - Overall outer diameter: 10.4 inches / 265mm - Easy "click-in" construction - Cast and polished 316 stainless steel fittings - Strong ABS molded design, anti-aging, anti-corrosion, ultraviolet resistant. Specification: - Round shape porthole for boat/yacht/RV/cars of the industry - Corrosion-free synthetic fittings and waterproof, durable rubber seals - Tempered glass for strength, clarity and chemical resistance - Both fittings can be loosened to allow you to open the porthole - Easy to fit, pre-drilled countersunk fixing holes (screws not included) - Diameter of opening with open window: approx. 7 3/4 inch / 197 mm Fitment: 1 piece porthole Note: 1.The actual color of the the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow a slight deviation for the measurement data. 3. please allow 1cm-2cm error due to hand measure. If you have any questions, please contact us. Wish you have a happy shopping time. shopping!c