The Kaba-Ilco Simplex 7100 Series light commercial / residential keyless lock features a sleek and robust design and deadbolt security.  You can use this lock alone, or with another lock in residential or small office applications.  The rugged all-metal construction is weather resistant, providing added strength and durability.  Kaba has been making push-button security locks for decades.  Their hardware is first-class and will endure years of use and weather.