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Pass-through clutch

The pass-through clutch is a feature of some cylinders that allows the key in one half of the cylinder to turn and operate the lock independently of the state of the key in the other half of the cylinder. This means that you can unlock or lock the door from one side even when the key is inserted on the other side. This feature is particularly useful in emergency situations where you need to gain quick and easy access to a locked area.

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