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Door Lock / Night Latch Type: BS Night Latches / High security lock certified to BS 3621:2007. Recommended by insurance companies. Latch automatically deadlocks on door close. Internal lockable handle for increase security. Supplied with 2 keys. Features: Suitable for Timber & Glass Panelled Doors / Anti-Carding / Key Operation from Outside / 20mm Bolt. Specifications: Suitable for doors 44-57mm thick. W x D x H: 90 x 65 x 100mm.