Butt Door Hinge also known as a butt hinge or a mortise hinge, is a type of hinge that is often used on both interior and exterior doors. It is made up of two flat metal plates with several knuckles on each that interlock when the door is closed. Butt hinges are usually mortised or recessed into the door and door frame, giving the door a clean and flush appearance when closed. They provide smooth operation, durability, and stability while swinging open and closed. Butt Door Hinge is available in a variety of sizes and finishes to complement various door types and doors. They are a dependable and popular option for residential and commercial doors.