Single Cylinder Deadbolts are the most common deadbolt type and are generally used in combination with an emtek passage door knob or lever handle on exterior doors. Single cylinder deadbolts require a key to unlock and lock the door from the outside. From the inside the door can be locked or unlocked with a simply turning the thumb turn mechanism.

See Also: Double Cylinder Deadbolts | Keyless Deadbolts | Single Sided Deadbolts