Maximum Door Thickness: 54 mm Nightlatch Width: 70 mm Deadlock Width: 67 mm features: Narrow style front door security locks 77015 security nightlatch with 78480 security deadlock keyed alike (see product codes for dimensions) One key operates both locks Supplied with 3 keys. Additional keys can be ordered - see related products below Conforms to British standard 3621:2004 and Insurance approved 6 pin drill resistant cylinder Nightlatch and deadlock come with 20 mm bolt throw Nightlatch automatically deadlocks and the bolt can be held in the withdrawn position Drill resistant integral cylinder pull Bolt through heavy duty security roses protect the cylinder Deadlock has hardened steel plates to resist drilling and four hardened steel rollers in the deadbolt to resist hacksawing