Simplex 7100 Series Mechanical Pushbutton Lock with ThumbturnSimplex 7100 Series 7102 Mechanical Pushbutton Lock with Thumbturn Simplex Mechanical Pushbutton Locks eliminate problems and costs associated with issuing, controlling, and collecting keys and cards. Simplex 7100 Series provides fully mechanical primary or auxiliary pushbutton access control by exterior combination, while allowing free egress at all times by interior thumbturn. Deadbolt models must be manually relocked. This fully mechanical lock