Sargent & Greenleaf 8415-107 S&G Extension 50 Mechanical Automatic Door Deadbolt with Tube, Group 1, Less Strike, 3.4" Door, D041/R162, B&W

Surface mounted for ease of installation and suitability for a wide range of applications. Automatic locking deadbolt mechanism incorporates an inside release knob for rapid egress, and a manual "dogging" switch to keep the device unlocked when the secured area is occupied. Strikes available for both inswing and outswing doors. An ideal security solution for indoor applications, such as ATM rooms, cash handling areas, research laboratories, etc. All units include a rectangular hardplate that is placed under the mounting plate to deter forced entry attacks. Interlocking strike (any model) prevents spreading of the door and frame. Hardened steel pins inside the locking bolt deter sawing and increase forced entry resistance.For 3/4" doors. Includes D054 Dial and R162 Ring. Strike not included.