Single cylinder deadbolts require a key to unlock from the outside but unlock with a small knob or thumb turn on the inside.
Lever as extra door locking measure.
Locking hardware offers featuring thick door kits of all types including thick door kits lock parts thick door installation kit conversion kit thick door pack thick door screw pack at reasonable prices.
The following handlesets will fit doors up to 3 thick.
Measure from the center of the door knob hole to the edge of the doorway to find the size of the door set.
Backsetthe distance from the edge of the door to the center of the lock bore.
In most cases the door set which is inside of the door and controls the door latch will.
Other backsets include 2 used by national and lori lock and 5 used by weiser weslock kwikset and others.
Two standard backsets are 2 3 8 and 2 3 4.
Commercial din style locks will have a very large case due to the separation distance requirements of the keyhole and handle more on this below while others may be a little as 100mm 10cm.
Some knob and lever sets include deadbolts.
Deadbolt locks create a second locking point for your door when paired with a locking knob or lever giving you an additional measure of security.