Description: - 4mm (0.15 inch) thick tempered glass - Overall outside diameter: 8 inch / 215 mm - Easy click-in construction - Cast and polished 316 stainless steel fittings - Solid ABS molded design, anti-aging, anti-corrosion, ultraviolet resistant. Specification: - Round shape porthole for boat / yacht / RV / industry cars - Corrosion-free synthetic fittings and waterproof and 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 install, pre-drilled countersunk fixing holes (screws not included) - Opening diameter with open window: approx. 147 mm Note: 1.The actual color of 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. of light. 2.Please allow slight deviation for the measurement data. 3.Please allow 1cm-2cm error due to hand measurement.