Why does Peterson manufacture the most useful tools for security professionals? We ask the locksmiths what they need. And when you told us you needed an I-CORE drill jig that was easy to use, would NOT DAMAGE DOOR HARDWARE and would allow you to DECODE THE CYLINDER, that's just what we made! Here it is: The small format I-CORE drill jig that beats them all! No control key? No Problem! Damaged Core? No Problem! Made of hardened tool steel, this fast and efficient instrument is ready to use the way YOU need it. Drill out the control shear line with surgical precision for those one-time removals. Or shear off the I-CORE locking lug from within the core profile on all brands of "Best Type" I-CORE cylinders, with no damage to door hardware. An untouched pin stack means that the core can be decoded for control and master keys. Think about all the door hardware and I-Core locks you can save. Turn a multi-drill job into a one-drill wonder with the Peterson I-Core Drill Jig. Packaged in a compact tube type case, the tool comes with complete instructions and our top quality drill bits and guides. You provide the drill and the key blank (or any key for that key-way) to complete your core-busting arsenal.