Feature: 1. Smoke Grey Tempered Glass: 6mm thick smoke grey glass provides strength and safety, filters UV rays while allowing light to enter the cabin, perfect for enhancing interior brightness or ventilation. 2. Flexible Opening: The inward opening design with fixed handle, the porthole can be opened at any angle for scenic views, suitable for boat, yacht, ship, and RV projects. 3. Versatile Usage: The inward opening porthole is ideal for storage compartments, living spaces, lounges, bathrooms, or any desired location, adds functionality as an interior light enhancer or ventilation window. 4. Easy Installation: Suitable for 26 to 36mm thickness installation, this marine window provides a solution for leaky, damaged, or unsatisfactory window. 5. Robust and Sturdy: Crafted with premium stainless steel and polished for smoother touch, this porthole window ensures rust resistance and durability in harsh marine and outdoor environments. Specification: Item Type: Boat Opening Porthole Opening Method: Open inside with stainless steel retaining ring Outer Size: Approx. 575 x 250mm / 23 x 10inInstallation Opening Size: Approx. 526 x 202mm / 21 x 8in (Please allow a 2mm error for manual measurement)Installation Thickness: Approx. 26-36mm / 1.02-1.42in Fitment: Suitable for Boat, Yacht, Nautical, RV, it can be used for your ship, yacht, RV modification and installation projects, providing a solution for your water leakage, damage, and unsatisfactory window Installation: The window is an inward opening type, the glass with the handle is installed in the cabin inner side, and the fixing clamp ring is installed on the outside. Package List: 1 x Boat Opening Porthole1 x Fixing Frame Note: The installation is a little bit difficult, if you are not professional, we recommend looking for a professional engineer to assist with the installation to get the best purchase experience.