Works on most standard, non ball bearing 4 1/2 x 4 1/2" hinges. This is the new updated version. You can now adjust your worn hinges two ways. You can do it normally by slipping it over the worn hinge, and opening the door to adjust the hinge. The second method is to slip it over the hinge, and use an adjustable wrench, slip it into the slots on the tool, and manually adjust the hinge. Either way, you'll be done quick without pulling the door or hinge off!