Grade 13 Slim knuckle hinge, Square. (Max Load 120kg) They have a CE mark & are Certifire tested. BS EN 1935 rated. Comes with a 25 year mechanical guarantee & are fire door rated. Suitable for all domestic, commercial & industrial use. 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 evenly & will help to overcome twisting or warping. This can sometimes happen to doors over a period of time where heat & moisture are a...