1. Exquisite craftsmanship, sturdy and durable: SHENGHUISS heavy-duty solid boat hinges, fine polishing, mirror gloss. The combination of sturdy structure and elegant appearance is perfect, suitable for various scenarios such as boat hatch, RVs, or doors, windows, cabinets in furniture, showcasing excellent quality and practicality. 2. Marine grade material, long-lasting waterproof: Made of 316 stainless steel, excellent waterproof performance, durable and corrosion-resistant. Marine grade 316 stainless steel hinges ensure that remains as new after long-term use. 3. Reduce friction and extend lifespan: Unique hinge bearing design makes smooth rotation and protects connecting components. Effectively reduce the boat door hinge wear and tear, extend service life, and make life easier. 4. Six hole symmetry, stable and reliable: The six hole symmetrical design securely locks the position to prevent loosening and shaking. The symmetrical structure enhances the load-bearing capacity and ensures stability when the boat hinge is frequently opened and closed. 5. Detailed parameters: Two hinges: 4 inch(102mm)Lx 1.5 inch (38mm)Wx 0.38 inch (9.6mm)H, with 12 screws: 0.75 inch(19mm)L x 0.19 inch (4.8mm)W. This SHENGHUISS Boat Door Hinge Strap Marine Hatch Hinge is made of high-quality 316 stainless steel, which is strong and durable, not easy to rust or corrode, and can be used in marine environments. The surface is treated with black oxidation, which has a good anti-corrosion effect and is not easy to fade. It has a wide range of applications and can be used for various types of boat doors, such as boat hatches, cabin doors, and storage boxes. The hinge is equipped with 6 holes, which can be adjusted according to the size of the hole to ensure a tight fit and prevent water from leaking. The package includes 2 hinges and 16 screws, which can be used for various types of boats and are easy to install.