Deadbolts

A deadbolt or deadlock cannot be moved to the open position without using a key to rotate the lock cylinder and retract the locking bolt. A deadbolt is more secure than a latch and come in following varieties:

• Single cylinder:  Cylinder on the outside and turn snib on the inside
• Double cylinder: Cylinders on the inside and outside.
• Exit Only: No external cylinder, turn snib on the inside