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5 star Exactly what I needed

I was replacing the deadbolts in our new home and the old ones were an odd size bore. I needed to expand the holes to a standard size but my regular hole bores wouldn't work because there was nothing for the guide bit to center on. This jig allowed me to enlarge the holes without worrying that the bore would walk across the surface of the door and scar it up. Worked great and was so easy to use. Great product!!