Abstract: A lock 10 to be mounted in a sliding door or window. The lock 10 includes a lever 17 that is used to retract and extend the locked tongue member 15. On the inside of the door there is provided a first cylinder lock 24 that is operable to release the tongue member 15 for movement from the extended position to the retracted position thereof while provided on the outside of the door is a lock cylinder 27 that is operable to lock or to release the tongue member 15 for movement from the extended position to the retracted position and operable to move the tongue member 15 between the extended and retracted positions thereof.

Abstract: A lock 10 to be mounted in a sliding door or window. The lock 10 includes a lever 17 that is used to retract and extend the locked tongue member 15. On the inside of the door there is provided a first cylinder lock 24 that is operable to release the tongue member 15 for movement from the extended position to the retracted position thereof while provided on the outside of the door is a lock cylinder 27 that is operable to lock or to release the tongue member 15 for movement from the extended position to the retracted position and operable to move the tongue member 15 between the extended and retracted positions thereof.