5 lever British Standard High Security Mortice Lock|Meets the requirements of BS3621:2017 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|Sashlock features an easily reversible latch bolt without the removal of the lock cover 1,000 key variations for added security Suitable for External Doors|10 Yr Mechanical Guarantee