This can pose a significant problem in a fire or other emergency situation.
If used in a residential situation, it is strongly recommended that a key is left on the inside when people are present to ensure a safe exit in an emergency.
These have the clear disadvantage of always requiring a key to open the door from the inside if it is locked.
Knob locks are frequently installed in residential situations on exterior doors in addition to deadbolts, and are sometimes used as the primary source of security for doors.
First and foremost, it should be said that knob locks should virtually never be used for security on external doors.
A thumb turn (or turnkey) is an oval or crescent shaped knob used to operate the dead bolt of a privacy or entry mortise lock.
Our thumbturns are available in sturdy brass and iron and include thumb turn, back plate and spindle.
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This type of deadbolt provides maximum flexibility and security in most situations.