Amarine Round Opening Porthole 8" Replacement with ABS frame and Tempered Glass in White. Sold with free shipping. Overall Diameter: 8.5" Glass Window Diameter: 5" 4mm thickness tempered glass Diameter Opening w/ Open Window: 5 3/4" Boat Yacht Round Opening Portlight Porthole 8" Replacement Window Port Hole - ABS Tempered Glass ABS Anti-aging, Anti-ultraviolet Casted and polished 316 stainless steel accessories Easy "click-in" construction Corrosion free synthetic fittings and durable rubber seals Boat Yacht Round Opening Portlight Porthole 8" Replacement Window Port Hole - ABS Tempered Glass Corrosion-Free Synthetic Fittings Durable Water-Tight Rubber Seals Casted and Polished 316 Stainless Steel Accessories Strong ABS Molded Design, Anti-Aging, Anti-Corrosive, Ultraviolet Resistant Boat Yacht Round Opening Portlight Porthole 8" Replacement Window Port Hole - ABS Tempered Glass Easy click-in design Heavy duty durable rubber seals 1/4" 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)