Aluminum butt hinges consist of two plates, or leaves, joined by a central pin, allowing them to rotate relative to each other. The plates are mortised into the door and the frame, leaving only the knuckle visible when the door is closed.
Size: 2″ X 7/8″, 2.1/2″ X 7/8″, 3″ X 7/8″, 4″ X 3/8″.