These door hinges are manufactured from solid brass and are fitted with either double stainless steel washers or double phosphorus bronze washers to prevent rust, ideal for the aesthetics of your home. 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. It will look aesthetically pleasing and from a practical viewpoint, it helps spread the load evenly and will help to overcome twisting or warping