A two-part Special Lock out Key Blank that uses the KW1 keyway.
How It works:
Stick the bottom part " A " into a lock and pull back. The key gets trapped.
Stick the top part " B " into the lock, pull both A and B out at the same time.
Use this key to lock out any key from working the lock. Often used by landlords to restrict access to keep unpaid tenants out of an apartment or room until they pay their rent. Often used in rest homes after a patient dies to discreetly secure a door to protect personal belongings of the deceased.