The 1000 Series lock provides fully mechanical pushbutton access control with no electrical wiring, electronics, or batteries. Exterior access is by combination. Egress is by interior knob and is free at all times. 1000 Series locksets are the best choice for limiting access to high-traffic, security-sensitive areas in commercial, institutional, residential, and industrial buildings. These locks are ideal for locations with a high personnel turnover rate such as data processing centers, employee entrances, R&D labs, apartments, dormitories, and restricted areas in hospitals and airports. The pushbutton design eliminates problems associated with the issue, control, and collection of keys and magnetic cards. The combination can be quickly and easily changed to ensure continued maximum security once employees, tenants, or guests leave, saving the cost of new keys, key cylinders, magnetic cards, and card-encoding devices.