Butt hinges are widely used in the United States, so most Americans will frequently incorporate butt hinges throughout their homes. Interior and exterior doors may also incorporate butt hinges, but the use of stainless steel or brass will typically be required to help prevent corrosion that disrupts hinge movement. Cabinet doors were once most commonly equipped with butt hinges, but the rising popularity of Soss Invisible and Poly Concealed hinges has changed that. Butt hinges are easy to use and simple to construct, but their correct installation will require a router to ensure smooth mortising for a flush finish.