Simplex 1011 - Combination Entry Only Tough-as-nails 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.  The Kaba Simplex 1000 Series is a heavy-duty stand-alone security lock that is highly weather resistant.  Entry is gained with a 1 to 5 digit, sequential code.  The simple, vandal resistant design makes the lock blend in well, and hold its ground if attacked.  It's not uncommon to run across dozens of Simplex locks in high-traffic commercial, institutional, and government buildings.