STURDY AND DURABLE: Constructed 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 swing door hinges provide a simple and effective way to swing the door easily and quietly. Solid Swing Door Hinge with Sturdy Design and Almost Invisible Smooth Bearings Easy Installation: Sleek design with up and down link function makes installation quick and easy. The concealed pivot door hinge can be mounted at the top level of the door and is attached to a hole on the door surface Many uses: concealed pivot door hinges work great for swing doors, kitchen cabinets , closet doors, casement windows and much more. Perfect Replacement Door Hinge for Your Old or Damaged Ones Buy with Confidence: With a compact design and solid construction, these rotary door hinges are a nice accessory for your door hardware. Please feel free to contact our customer service if you have any puzzles on our items, and we are always ready to provide our customers with 100% satisfactory service.