Kaba Simplex 920 Pushbutton 900 SeriesSimplex 900 series deadbolt model for 1 3 8" to 1 1 2" thick door supplied in brushed chrome finish. Keyless Security SIMPLEX 900 series auxiliary pushbutton locks from ILCO UNICAN are designed for easy installation in addition to, or as replacement for existing locks. Simplex 900 series are fully mechanical not affected by power failures. Mechanical pushbutton access controls provide a high level of security and eliminate the key control problems