Boat and RV owners, this VEITHI inspection hatch is such a useful addition for maintenance access and storage! The 7.2-inch inner diameter (9.8-inch outer diameter with 7.7-inch cutting size) provides plenty of room to reach through for repairs or storage access. Made from high-quality ABS engineering plastic, it's seriously durable - resistant to UV rays, corrosion, and impacts, which is crucial for marine environments. The non-slip square pattern on the surface is both functional and looks professional, providing good traction even when wet. The 180-degree opening design means the cover swings completely out of the way, and the detachable feature makes installation and cleaning easy. The included rubber sealing ring creates a watertight seal that actually works - I've installed mine in a boat deck, and it's kept water out through heavy rain and splashing. The package includes 6 stainless steel screws that resist corrosion in saltwater environments. Installation is straightforward - just cut the appropriate hole and secure with the provided hardware. I'd recommend using silicone sealant around the edges for extra waterproofing protection. Perfect for creating access points to storage areas, electrical systems, or plumbing on boats, RVs, campers, or even as utility access points around your property. The black color looks sleek and professional, blending well with most deck surfaces. Definitely a quality marine-grade product that makes maintenance and storage organization so much easier!