The Gator Mortise Wrench is made especially for those times when you just cant use pliers on a mortise cylinder. The low profile construction will allow you to grip the smallest edge on a cylinder. As long as its not deeply recessed into the door, you should be able to use the Gator Mortise Wrench to quickly remove even the most stubborn mortise cylinder without damage. Made in the USA from super tough poly-ethylene.This tool is a great one handed lock removal and installation tool. It will not scratch thefinish on the lock or the door. It is a one handed operation and can handle keyed mortise locks, thumb-turn mortise locks, and dummy cylinders (no keyhole). Using the tool is a process of squeezing, turning and then releasing and then repeating much like an oil filter wrench.