The British Standard High Security Mortice Lock meets the new BS 3621:2007 standard, which meet the exacting demands of the insurance companies and the police|1000 key variations|High security levels are delivered by a 20mm bolt throw on every lock|All locks have hardened steel plates to resist drilling|False notching in levers resist lock picking|Interior & Exterior|Material: Steel & Zinc Alloy|Fixings included|10 year guarantee and warranty