Performance complies with ANSI (American National Standards Institute) A156.5, Series 4000. UL (Underwriters' Laboratories) rated. 3 hour fire door. Door range: 1-3/8" - 2". Adjustable backset. Square corner, T-strike. Door frame strike reinforcer with 3" screws. 7/8" wrought brass trim ring. Both knobs always unlocked. 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