Advantage:[Material] - The hidden door pivot hinge is made of 304 stainless steel, elegant appearance, rust and scratch proof. It supports heavy and wide doors with ease and stability. Solid rotation door hinges with smooth bearings are nearly hidden from view and are one of the necessary accessories in home life.[Smooth Rotation] - The door pivot hinge provides a simple and effective way to easily rotate around the central axis to achieve a quiet revolving door. The thickened material can ensure the door rotates smoothly at 270°/360°.[Easy Installation] - The up and down link function makes its style more avant-garde, quick and easy to install; Due to the up and down link function,you just need to install the hinges with screws in the corresponding positions of the upper and lower door frames respectively.