Square Porthole（Black） Description: ABS anti-ageing and UV resistant 4mm thick tempered glass, water resistant seal Corrosion free synthetic and durable rubber seals Outer Length*Width: Approx. 400mm*200mm/15.75*7.87 Inch Inner Length*Width: Approx. 320*128mm/12.60*5.04 Inch Round Porthole(8 inch) Description: - 4mm(0.15inch) thickness tempered glass - Overall Outer Diameter: 21cm Detail : 1. Round shape porthole for Boat/Yacht/RV/Industry Cars 2. Corrosion free synthetic fittings and durable water-tight rubber seals 3. Temper Glass for Strength, Clarity, and Chemical Resistance 4. The two fittings can be loosened to allow you to swing open the porthole 5. Easy to install, pre-drilled countersunk fastening holes (screws not included) Round Porthole(10 inch) - 4mm(0.15inch) thickness.
eBay