Light-duty commercial entry lever. Performance complies with ANSI A156.5 (American National Standards Institute), Series 4000, Grade 2 auxiliary lock and ANSI A156.5, 2001 Series 4000, Grade 2 UL (Underwriters' Laboratories) rated. 3 hour fire door. 5-pin solid brass cylinder, keyed 5-pin, C-keyway. 2 nickel silver cut keys per lock, 5-pin, C-section. Adjustable backset. Strike: 1-1/8 In. x 2-3/4 In. square corner T-Strike. Door frame strike reinforcer with 3 In. screws. Turn button locking. Unlocked by key outside or by turn button inside. Inside knob always unlocked. Fits door thickness 1-3/8 In. to 1-3/4 In.