Deadlocks are a popular choice in the UK due to their reputation for being extremely reliable and rigorously tested against all common attack methods. Deadlocks meet British Standard BS3621 and have been awarded the British Standard Kitemark making them a common prerequisite for many insurance policies. You’ll usually find them on a wooden door and is usually the primary lock for securing the premises. They need to be manually locked and unlocked. Deadlocks are also known as Chubb Locks and Five Lever Mortise locks.
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