Backset

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The distance measured from the edge of the door to the center-point of the bore hole.

 

The door-prep image seen to the left applies to any standard tubular lock or latch set including interior door knobs, door levers, deadbolts, entry door handle set, and door handle plates.

 

You can see the bore hole that is 2-1/8" in diameter. The distance from the edge of the door to the center-point of this bore hole is the backset.