High security lock suitable for external applications, particularly front and back door. Certified to BS3621:2004 as required by some house insurance policies and recommended by the police. 3 keys supplied, includes fixings. Chrome finish. Specifications: Backset 2.5" / 64mm. W x D x H: 30 x 64 x 200mm. BS 3621: 2007, EN 1634-1. For internal and external application.