What Is the Backset in Locks? The backset (Dornmaß in German) is one of the most important measurements when it comes to door locks. https://locksmithcal.com/locksmith-in-victorville-ca/ It refers to the distance from the center of the keyhole to the outer edge of the lock's faceplate (known as the stulp). This measurement ensures the lock fits properly within the door.
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