Different designations are possible: FRL, freewheel function
In the case of special panic or automatic locks, as well as motor-driven locks and doors that are too closed, the lock must be released without interference when the lever handle is operated. This is only possible if the cam can rotate freely. In case of doubt, please check with the door manufacturer.
When a key is inserted into the keyway of the cylinder, the spring-loaded clutch in the cam engages. This then allows the cylinder to be closed in the conventional way with the key.
It should be noted that due to the design restrictions on the cylinder length are possible
e.g.: KESO cylinder only from length 35/35 mm.