Simplex 5021XSWL - Combination Entry (change codes from exterior) & Key Override Industrial strength combination lock from the leader in top of the line security solutions, Kaba Ilco. Kaba has been making high quality security products for over 100 years. For a security lock, the highly weather resistant Simplex 5000 Series earns a Grade 1 rating from ANSI. (American National Standards Institute) This marks the highest rating they give out for quality. Your Simplex 5000 grants entry upon successful validation of a 1 to 5 digit sequential code which you pre-program into the lock. Vandal protected, the Simplex series of PIN based locks find widespread acceptance in high-traffic commercial, institutional, and government buildings.