STURDY AND DURABLE: Made of heavy duty stainless steel with maximum corrosion resistance and durability, the hidden door center pivot hinges are made to provide reliable support for years to come. PRACTICAL AND INVISIBLE: With unique roller ball design, these 360 degree rotating door pivot hinges provide a simple and effective way to swing the door easily and quietly. Solid rotation door hinge with heavy duty design and smooth bearings is nearly hidden from view. EASY INSTALLATION: The sleek design with up and down link function allows for quick and easy installation. The rotation hidden door pivot hinge can be mounted on the top level the door and is attached to a hole on the surface of the door. WIDE APPLICATIONS: The concealed rotating door hinges work wonderfully for swinging doors, kitchen cabinets, closet doors, flip windows and so much more. Perfect door hinge replacement for your old or damaged ones. BUY WITH CONFIDENCE: With compact design and solid construction, these rotary door pivot hinges make a nice accessory for your door hardware. Specifications: Material: Stainless Steel Color: Silver Dimensions: 75 x 17 x 20 mm / 2.95 x 0.67 x 0.79 in (L x W x Max.H) Mounting Hole Diameter: 5 mm / 0.2 in Shaft Diameter: 14 mm / 0.55 in Thickness: 2.8 mm / 0.11 in