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. Strong rotation door hinge with a sturdy design and smooth, almost invisible 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 straining traditional door frame hinges is a concern Buy with Confidence: With a compact design and solid construction, these rotating door hinges are a nice accessory for your door hardware. Material: