Feature: 1. Secure and Convenient: Equipped with a safety lock and matching key, it provides secure and convenient access to your storage space. It is perfect for RVs, campers. 2. Large Capacity: With large opening and secure lock, can accommodate large items and ensure the safety of your belongings, can be installed horizontally or vertically. 3. Excellent Seal Design: Equipped with sealing strips, it ensures complete sealing, waterproofing, and great shock absorption. It also offers excellent insulation and soundproofing performance. 4. Easy to Use: With a 500x500mm size design that can be opened up to 0‑180 degrees, it offers easy access for storing larger items. The exterior design has no external fasteners for a sleek look. 5. Material: Made with a heavy duty aluminum alloy frame and ASA panel with high UV resistance and surface electrostatic spraying, it has excellent anti corrosion and anti rust performance. Specification: Item Type: Marine Access HatchMaterial: Aluminum alloy + rubber + ASAHatch Size: Approx. 520x520mm/20.47x20.47in .Installation Opening Size: Approx. 500x500mm/19.69x19.69in, R70-4Applicable Mounting Thickness: 25-55mm/0.98-2.17in Application: Suitable for RVs, campers, etc Package List: 1 x Marine Access Hatch2 x Key Note: 1. Manual measurement, please allow 3mm error2. Professional installation is highly recommended, please look for professional engineers to assist in installation to get the best shopping experience3. Please confirm that it is the correct size you need before purchasing