Height: 100 mm Width: 76 mm Thickness: 2.5 mm features: Ratchet adjusting spring hinge Automatically closes door Alternative to door closer Ratchet design allows for quick fine tuning tension up or down with allen hex key supplied For use on internal doors only Use three hinges per door Centre hinge can be used without tensioning Max. door weight 60 kg Max. door size 2134 x 914 mm Steel - plated finish Suitable for 30 min fire doors when fitted with intumescent linear - see related products