The door also includes a 4th locking pin that can only be installed and removed from the inside. The ESP design does not rely solely on deadbolts as the primary locking mechanism. The three steel pins securely lock the door closed within a 3 deep steel jamb pocket. A single handle operation locks all three pins into place in a single motion so there is never any need to waste precious time trying to lock three or four deadbolts to secure your door.
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