Sturdy and Durable: Made of heavy-duty stainless steel with maximum corrosion resistance and durability, the hidden hinges are made to provide reliable support for years to come. Convenient and Invisible: With a unique ball design, these 360-degree pivot door hinges provide a simple and effective way to swing the door easily and quietly. Solid rotation door hinge with a sturdy design and nearly invisible smooth bearings. Easy Installation: The top pivot comes with a retractable spindle for quick and easy installation. The hidden pivot door hinge can be mounted at the top level of the door and is fixed to a hole on the door surface. Widely Uses: The concealed rotating door hinges work great for swinging doors, gates, and more. Great pivot adjustment option when the weight of the door strains traditional door frame hinges.