Performance complies with ANSI (American National Standards Institute) A156.5, Series 2001, Grade 1 light commercial auxiliary lock. UL (Underwriters' Laboratories) rated. 3 hour fire door. 5 pin solid brass cylinder, keyed 5-pin, C keyway, keyed different. 2 brass keys per lock. Door range: 1-3/8" - 1-3/4". Adjustable backset. Strike: 1-1/8" x 2-3/4", 1/4" radius corner, strike number 10-116. Door frame strike reinforcer with 3" screws. Deadbolt thrown or retracted by key from outside or by inside turn piece. Bolt automatically deadlocks when fully thrown. In accordance with California Prop 65 WARNING: Cancer and Reproductive Harm-www.P65warnings.ca.gov ADVERTENCIA: Cancer y Dano Reproductivo-www.P65warnings.ca.gov AVERTISSEMENT: Cancer et Troubles d l'appareil reproducteur-www.P65warnings.ca.gov - Lead