Smooth Rotation: The thickened material can ensure the door rotates smoothly at 270/360 rotation shaft designed, smooth and unobstructed, suitable for revolving doors.Countersunk hole design is not protruding, porous fixed, not shifting.Through the unique ball design, the 270/360 rotating door pivot hinge provides a simple and effective way to easily rotate around the central axis to achieve a quiet revolving door.Package Included& Dimension: With 2 Pack pivot hinge and 16 screws.Total Dimension: 2.95 x 0.71x 0.79/ 75mm x 18mm x 20mm. Mounting Hole diameter: 5mm / 0.2. Plate Thickness: 2.8mm / 0.11.EASY INSTALLALTION: The up and down link function makes its style more avant-garde,quick and easy installation; rotating hinge position shaft also has the function of upper and lower door hidden pivot, the hinge of rotating hidden door pivot can be installed on the top layer of the door and connected to the hole on the surface of the door. Fix the position of the lock screw first, then install it and use it and it is almost invisible after installation.WIDE APPLICATIONS: The concealed rotating door hinges work wonderfully for revolving door, swinging doors, kitchen door, cabinets, closet doors, flip windows, wooden doors, aluminum frame doors,and so much more. Perfect door hinge replacement for your old or damaged ones.High Quality: Hidden door pivot hinge is made of high quality 304 stainless steel, it is corrosion resistant, do not rust, strong bearing capacity. which ensures durable longevity and durability,With unique roller ball design, the 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 and is one of the indispensable accessories in home life.