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What is a ‘key and turn’ cylinder lock?

This particular type of cylinder lock is key operated externally and has an internal knob, called a thumbturn. Different styles are available, depending on the manufacturer. The internal thumbturn mechanism will enable you to easily lock and unlock the door from inside, if required, while allowing access from outside with the key. This prevents accidental lockouts caused by the key being left in the back of the door, and allows for emergency exit.

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