For use in exterior and interior doors where keyed entry and security is needed. This link is for left-handed doors, with a brushed nickel finish and comes with 3 keys. It includes durable all-metal construction, with a backset that is reversible between 45MM, 60MM (2-3/8"), and 70MM (2-3/4"). Fits doors with a thickness of 33-53MM (1.3"-2.1"), and the rose diameter is 65MM (2.56"). Please contact the seller for a free replacement if you receive a defective product or parts are missing.