5 lever British Standard High Security Mortice Lock|Meets the requirements of BS3621:2007 and is suitable for the demands of the insurance companies and the Police|High security levels are delivered by a 20mm bolt throw|Hardened steel plates on both to resist drilling|Twin hardened steel plates in the Deadbolt resists hacksawing|1,000 key variations for added security|Steel levers have false notching to resist lock picking