TSS British Standard BS3621:2007 5 Lever Mortice Deadlock. Available in brass, satin chrome and chrome finishes. The case itself has an Anti-Drill hardened plate, which makes it robust and provides additional protection against attack. The deadbolt features hardened anti-saw rollers to provide a higher level of security. Supplied with 3 keys and two keyhole escutcheons, one with a cover and one plain, for convenience and value. Can be keyed alike with both Deadlocks and Sashlocks. Not suitable for masterkeying.