This grade 13 ball-bearing hinge, square (max load 120kg) is the most popular type of door hinges on the market today. They have a CE mark and are certified tested. Suitable for industrial, commercial and domestic use. Ball-bearing hinges have always been very popular for their smooth operation, durability, long-lasting design and ability to carry heavier loads. 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 and from a practical viewpoint, it helps spread the load evenly and will help to overcome twisting or warping. This can sometimes happen to doors over a period of time where heat and moisture are a factor. Comes with a 25-year mechanical guarantee and are fire door rated.