1. Sturdy Metal ConstructionThe solid metal construction is made of thick 304 stainless steel, which is strong and durable. The surface is specially treated to prevent rust and breakage, fine workmanship, and extended life. 2. High LoadBearingEngineered to support up to 570 LB/ 260 kg, this hidden door hinge provides unmatched strength and durability, making it ideal for heavyduty applications such as large secret doors and substantial bookcase entries. 3. 360° Smooth RotationThe pivot hinge is designed for ultimate flexibility, 360° switchable, installed on the side, 180° switchable, suitable for all styles, installed in seamless hidden doors, bedrooms, kitchens, basements. They create a clean, elegant look. 4. Versatile and FunctionalWhether you're creating a secret room, installing a hidden bookcase, or simply looking to improve the functionality of your doors, this hinge is versatile enough to meet your needs. Its superior design and functionality make it an excellent choice for a variety of hidden and swinging door applications.