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. 2 keys supplied, includes fixings. Brass effect finish. Specifications: Backset 3" / 76mm. W x D x H: 16 x 76 x 109mm. BS 3621: 2007. For internal and external application.