This high-quality porthole is not only an elegant window to the outside world but also provides the strength and durability needed in the challenging maritime environment. Features: Material: Made with premium stainless steel, this porthole guarantees resistance to corrosion and a long lifespan, even under the harshest weather conditions at sea. Diameter: With a generous diameter of 307 mm, it offers a clear view outside while simultaneously allowing enough light in to illuminate the interior space of your vessel.