Feature 1Marine Grade Aluminum: The overall frame and hinges of the porthole are made of marine grade aluminum material, ensuring that the overall durability of the porthole will not be eroded even in harsh marine environments. 2High Light Transmission: The 10 mm thick transparent glass ensures the overall robustness and safety of the window, the high light transmittance glass ensures that the light can enter the cabin, improve the brightness of the cabin, and can also be used for ventilation Windows. 3Inward Opening Window: The 9in round porthole has an inward opening design with a fixed handle to help you open and close. The porthole can be opened at any Angle from 0 to 180 degrees. 4Applicable Installation Location: Round portholes can be used in storage compartments, living rooms, lounges, bathrooms or any other location that needs to be installed, can be used to enhance indoor brightness or exhaust Windows. 5Wide Applications: 5 to 22mm thickness installation, Good for boat, yacht, ship, and RV, ect... Can be used for your boat yacht RV retrofit and other projects, to provide a solution for your leaking, broken and unsatisfactory Windows.Item Type:PortholeInstallation Thickness: Approx. 5 to 22mm / 0.2 to 0.9inWindow Dimensions: Approx. Diameter 258mm / 10.2inInstallation Hole Size: Approx. 9in / 22.86cm DiameterScrew Aperture: Approx. 4mm / 0.2in (Excluding Bolts)Glass Thickness: Approx. 10mm / 0.4inSwitching Mode: Inward Open, With Fixed Ring .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; }Package List1 x Porthole2 x Install Fixing Plate