Operated by key outside and inside. All metal components. Rust resistant solid brass keyway for more security. Solid brass bolt with hardened steel rod insert to prevent sawing through for added security. DOOR PREP: 2-1/8 in Crossbore, 1 in Edge Bore, 1 in x 2-1/4 in Latch Face. DOOR THICKNESS: Fits 1-1/4 in to 1-13/16 in doors. CYLINDER: 6-pin, removable SC1 keyway, solid brass, one piece; re-keys to Schlage. With 2 nickel plated, solid brass keys. FACEPLATES: 1-1/8 x 2-1/4 STRIKES: 1 in x 2-1/4 in square corner. BOLT:Solid brass, steel reinforced 1 in throw. HANDING: Reversible for right or left hand doors. ANSI/BHMA: Exceeds Grade 2 Standards. U.L. Approved 3-Hour Fire Rating.