This brand offer a complete range of mortice locks for timber doors, including British Standard 5 lever locks which offer the maximum level of security for external timber doors Mortice locks are installed inside the door, and these serve a range of security levels and functions basis which individual can make purchase Mortice locks are installed inside the door, and there are a range of sizes, security levels and functions which you need to consider before you make your purchase If the distance is 45 mm/4.5 cm you will need a 64 mm/6.4 cm mortice lock, If the distance is 57 mm/5.7 cm you will need a 76 mm/7.6 cm mortice lock A Deadlock features a bolt which is operated by a key, and is often used in conjunction with a nightlatch