STURDY AND DURABLE: Made of heavy-duty stainless steel with maximum corrosion resistance and durability, the hidden door center pivot hinges are designed to provide reliable support for years to come PRACTICAL AND INVISIBLE: Featuring a unique roller ball design, these 360-degree rotating door pivot hinges offer a simple and effective way to swing the door easily and quietly. The solid rotation hinge with heavy-duty construction and smooth bearings is nearly hidden from view EASY INSTALLATION: The sleek design with up and down linkage function allows for quick and easy installation. The rotating hidden door pivot hinge can be mounted on the top of the door and is attached to a hole on the surface of the door WIDE APPLICATION: The concealed rotating door hinges work well for swinging doors, kitchen cabinets, closet doors, flip windows, and more. Ideal door hinge replacement for old or damaged hinges BUY WITH CONFIDENCE: With a compact design and solid construction, these rotary door pivot hinges are a reliable addition to your door hardware