The 5000 Series Extra Heavy Duty Pushbutton Lock is the latest addition to the line of mechanical pushbutton locks. The Simplex 5000 offers unparalleled strength, convenience, and flexibility. Exterior access is by combination. Egress is by interior lever and is free at all times. 5000 series locks 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 high-personnel turnover rates like date processing centers, employee entrances, R&D labs, and restricted areas.