High security 5 Lever Mortice Sash Lock resistant to drilling, hacksawing and picking through steel plates and false notching. 1.000 key variations for added security. Conforms to the BS 3621:2007; meets the exacting demands of insurance companies and the Police 20mm bolt throw for additional strength and security Designed with hardened steel plates to resist drilling and two hardened steel plates in the deadbolt to resist hacksawing Keys have 1.000 variations for added security All steel levers have false notching to resist lock picking Easily reversible latch bolt to enable both left and right handed operationFortress BS 3621Complete with keys64mm10 Year GuaranteeInsurance Approved