The Keylex 2100 mechanical digital lock is used widely in Police Stations, Banks, Building Societies & Hospitals its best use is on external doors or doors which will experience a constant flow of use. Suitable for heavy duty applications it prevents unauthorised entry to restricted areas. It has a mechanical operation so no need for wiring or batteries, its rugged design offers users over 16000 possible combination settings & the stainless steel buttons will not show any signs of usage. High quality mortice latch, the solid bolt ensures re-locking at all times Double slot design, dead latch snaps back when locked increasing security Prevents unauthorised entry to restricted areas Over 16000 possible combinations Operates by knob from both sides Stainless steel buttons will not indicate usage Passage facility (by code) supplied as standard Mechanical operation no wiring or batteries required Heavy duty mechanism allows many hundreds of operations per day Code Scramble allows all codes to be entered in any order Suitable for external, internal, timber, aluminium or steel doors Backset length 60mm Requires minimum stile width of 98mm