Abstract: A vertically elongated metal strike plate is mounted on the lock jamb of a sliding glass door or window by a pair of screws disposed on a substantially horizontal central plane through a vertically elongated strike plate aperture. The strike plate is vertically positioned so that when the door or window is slid into closed position and the lock stile is moved into abutment with the jamb, the latch hook projects through the registering central aperture. Then, when the latch is elevated by actuation of the locking lever the hook interferes with the upper back surface of the strike plate and prevents separation of the lock stile and the jamb.