Operated by key outside and turnpiece inside. All metal components. Rust resistant solid brass keyway for more security. Solid brass bolt with hardened steel rod insert to prevent sawing through. Cylinder drilled for construction keying. DOOR PREP: 2-1/8″ Crossbore, 1″ Edge Bore, 1″ x 2-1/4″ Latch Face. DOOR THICKNESS: Fits 1-3/8″ or 1-3/4″ doors. CYLINDER: 5-pin, removable, KW1 keyway, one piece solid brass; (2) nickel plated, solid brass keys. STRIKES: 1″ x 2-1/4″. BOLTS: Solid brass, steel reinforced, full 1″ throw. HANDING: Reversible for right or left hand doors. ANSI/BHMA: Exceeds Grade 3 Standards. ADJUSTABLE LATCH: Fits 2-3/8″ to 2-3/4″ square corner, radius corner, or drive-in applications; 1/4″ radius corner strikes. Limited Lifetime Warranty.