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4mm(0.15inch) thickness tempered glass;Overall Outer Diameter: 10.4inch/265mm;Easy "click-in" construction;Casted and polished 316 stainless steel accessories;Strong ABS Molded Design, Anti-Aging, Anti-Corrosive, Ultraviolet Resistant Round shape porthole for Boat/Yacht/RV/Industry Cars;Corrosion free synthetic fittings and durable water-tight rubber seals;Temper Glass for Strength, Clarity, and Chemical Resistance;The two fittings can be loosened to allow you to swing open the porthole;Easy to install, pre-drilled countersunk fastening holes (screws not included);Diameter Opening w/ Open Window: Approx. 7 3/4inch/197mm Box Contains: 1 x Porthole