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Standard Duty Commercial Entrance/Office Knob Lock
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This Corbin Russwin CK4451 is a standard duty cylindrical knobset which is ideally suited for quality residential applications as well as light commercial areas. This product meets ANSI/BHMA A156.2 series 4000 Grade 2 requirements. The entrance/office function necessitates a key for entry on the outside knob when the button on the inside is pushed in and rotated. The inside knob is always free.
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