Feature 1Parameter: The window size is 495x495mm, the installation cut out size is 425x435mm, and the installation thickness is 2355mm, or any thickness. 2Stronger: Sturdy ABS molded design and thick tempered glass for maximum durability. With anti aging, impact and corrosion resistant features. 3Waterproof Sealed: Designed with durable watertight rubber seal, effectively prevent rainwater from entering, no air leakage, good sealing. 4Opening Angle: Square design, with switch lock handle and support rod, 0160 degrees adjusted, convenient to enjoy the scenery along the way. 5Application: The windows are designed with tinted tempered glass with anti ultraviolet and anti aging effects, suitable for boat, yacht, ship, and RV.Item Type:BoatPortlightHatchWindowMaterial:Aluminum alloy + stainless steel + rubber + ABS + tempered glass .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Window Dimensions: Approx. 495x495mm/19.49x19.49inInstallation Cut Out Size: Approx. 425x435mm/16.73x17.13inSuitable Thickness: 23-55mm/0.91-2.17in, or any thicknessApplication:Applicable for Boat, Yacht, Nautical, RVPackage List1 x BoatPortlightHatchWindow1 xMounting FrameNoteInstallation is slightly more difficult, it is recommended to find a professional engineer to assist in installation