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May 25, 2009 
Years ago the standard size for a cross bore was 1 ½” in diameter. In order to include baffles and some other features the standard has changed to 2 1/8” in the last few years. If you are replacing an older lock with a newer one, that can be a problem. There are also cases where you might want to change the backset from 2 3/8” to 2 ¾” or vice versa. Making either one of those changes can be problematic if you don’t have an installation jig and those jigs typically have a price tag of hundreds of dollars.
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cylindrical lock, deadbolt, KIK, KIL, tubular lock