Took a class with Brotherhood Instructorss LLC, and am sold on the merits of the REX TOOL. This is an incredible lock cylinder pulling tool. About 24" in length, adds more leverage to the traditional "O" Tool with the wider "U" shaped gate for a "K" Tool bite on the cylinder. The immediate advantage is the ability to pull deadbolt cylinders and "Key in Knob" locksets quickly and efficiently. The 24 inches seemingly gives more weight to drive rim locks off the door. We do not carry them on our apparatus, but will certainly be singing its praise in an effort to have them purchased. Will probably be buying my own. Looked the tool up and saw some modifications by Andrew Brassard and Robert Morris which are now available commercially. Any other thoughts out there??????