Simplex 929 Series - Complies with DOD (Dept. of Defense) guidelines See all Simplex 900 locks The 900 series surface mounted keyless lock presents a push button interface with full mechanical access control.  Generally mounted above an existing keyed-in lock, this lock can be used as a primary or secondary lock.  It provides a no key, convenient solution for residential and light office doors.  Backed by the iconic Simplex name, the 900 series won't let you down.

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