The Knuckle Bender is three tools in one. It assists in removing the pin for door removal, aligns the hinge for pin installation and easily bends the knuckles on the door frame to adjust any sag in the door for perfect installation. This simple, unique tool saves fingers and knuckles from getting smashed with the hammer and can bend the hinge into place with ease. For someone working alone this device can be a huge time saver. Imported.