Grade 13 Ball Bearing Hinge, Square (Max Load 120kg). The most popular type of door hinge on the market today. They have a CE mark & are Certifire tested. Suitable for industrial, commercial & domestic use. Ball bearing hinges have always been very popular for their smooth operation, durability, long lasting design & ability to carry heavier loads than washered hinges. For standard internal residential doors a pair of hinges is adequate; however fitting 3 hinges per door has its advantages. It will look aesthetically pleasing & from a practical viewpoint it helps spread the load ev...