The thumb turn cylinder is a practical alternative to the double cylinder. On the outside, the thumb turn cylinder is operated with a key. On the inside there is a mechanical knob which is used to open and close the door "keyless".
The thumb turn cylinder is a practical alternative to the double cylinder. On the outside, the thumb turn cylinder is operated with a key. On the inside there is a mechanical knob which is used to open and close the door "keyless".
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