Works on most standard, non ball bearing 4 1/2 x 4 1/2" hinges and 5" x 5" ball bearing 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 the tool over the hinge normally, and then use an adjustable wrench, into the special slots in the tool, and manually adjust the hinge. Either way, you'll be done quick without pulling the door or hinge off!