Provides smooth operation, durability, long lasting design and ability to carry heavier loads than standard hinges Suitable for standard internal residential doors, a pair of hinges is adequate Approved in accordance with the BS EN 1935 standards, making it suitable for fire and smoke door assemblies With high quality wear resistant ball bearings, the door hinges will stay silent and smooth which is definitely long-last and durable Made of high-quality steel and zinc-plated for higher rust resistance Smooth ball bearing action makes this hinge ideal for doors with heavy domestic traffic