Having a security chain fitted on your door will allow you to guard against intruders and see who is calling at your door. They are inexpensive to buy and to fit. Simple chains will be screwed across two sides of the door, while more complex models can be fitted to a locking mechanism. This is very much the kind of job to get done when you have a locksmith or handyman calling to carry out other work, as this will give you the best value for their time. The job can be completed quickly by any tradesman with good experience of locks and working with doors.
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