TSS British Standard BS3621:2007 5 lever mortice sashlock. Easily reversible latch bolt, no need to open lock case. The case has black powder coating with rounded rounded forend with square faceplate. The box strike is colour matched to faceplate for an aesthetically pleasing appearance. Anti-drill hardened plate fitted to the case to provide additional protection from attack. Deadbolt features hardened anti-saw rollers to provide a higher level of security. Can be keyed alike with both deadlocks and sashlocks but not suitable for masterkeying.