Very versatile lock-puller. Between the two heads, it can pull just about any commercial or residential door lock. The Rex head (larger head) is great for rim locks, mortise locks, and for performing a ""knob-only"" removal on key-in-knob locks. The Truckman's Tool head (smaller head) is good for getting behind tubular deadbolts and for performing a full ""behind-the-collar"" removal on key-in-knob locks.