Lock or unlock by key outside, inside knob always free. All metal components. Solid steel deadlocking latch assembly. Rust-resistant solid brass keyway for more security. Seamless 1-Piece knob for extra strength. 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 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 of 1-1/8 x 2-1/4 Strikes of 1-1/8 in x 2-3/4 in square corner T-strike. Bolt Steel 1/2 in throw. Reversible for right or left hand doors. ANSI/BHMA Grade 2. UL approved 3 hrs fire rating.