Lock Installation Tool (Hole Move Over Tool)
Known in the trade as the "Move Over Tool"
This tool is the very best tool for redrilling the main lock hole - either 2 1/8th inch or 1 1/2 inch - and also for moving the backset from 2 3/4th inch to 2 3/8th inch
or vise versa. It clamps tightly to the door and guides the hole cutter through the door for a nice clean cut. This is the tool many proffesional locksmiths use because it allows a quick and accurate installation.
Please note that you also need to use a hole cutter and electric drill. These are not included.