This I-CORE drill-jig is easy to use, and would allow you to NOT DAMAGE DOOR HARDWARE, plus allows you to decode the lock so he could make a control key for larger jobs. The small format I-CORE drill jig that beats them all..... Used as directed and you will shear off the I-CORE locking lug from within the "Best Type" I-CORE, with no damage to door hardware or to the pin-stacks. Made of hardened tool steel. Uses any cut or uncut keyblank as a guide. Designed to work on all brands. User cuts off the top of the key's bow. Precise, fast and efficient! Comes with instructions and our top quality drill bits. Packaged in foam filled blow molded case. Includes storage tube for drill bits, guides, and key blanks. Think about all the door hardware and I-Core locks you can save.