The Schlage key-in-lever (KIL) cylinder plug face diameter measures between .608" - .612".
The Falcon key-in-lever (KIL) cylinder plug face diameter measures between .620" - .625".
A Schlage KIL cylinder will fit into a lever prepped for a Falcon KIL cylinder, but due to tolerances, a Falcon KIL cylinder might not fit into a lever prepped for a Schlage KIL cylinder.
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