Free slotting door hinges: There are 8 mounting holes distributed around each hinge made it more stable, and the fixing screws make the installation quickly and easily, no need to slot the door and no damage to the wooden door structure. Exquisite craftsmanship: The concealed hinges are forged from high-density stainless steel with anti-corrosion and anti-rust properties. Thick blade makes it load-bearing and durable, Each detail is finely polished. Ball bearing design: All bearings of the hinge are made of steel ball bearings. During the rotation, with the friction reduced, the speed and force of opening or closing the door can be automatically weaken, No more squeak or get stiff when you open or close the door, thereby achieving the effect of mute. Widely applications: No need to distinguish the left and right sides of the door, suitable for the installation of all internal or exterior doors, for example paint doors, paint-free doors, aluminum alloy doors, etc., versatile and fashionable. Applying superior bearing, the door hinges is capable of rotating 360deg and will not get stuck or stagnate, ensuring completely silent operation.