This door hinge is a heavy butt with either double stainless steel washers or phosphorus bronze washers which will not rust, ideal for maintaining a good appearance within the residence. The butt hinge is often considered more appropriate in residential properties due to the size of the hinge knuckle being smaller and more discreet than the knuckle on ball bearing hinges. Suitable 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.