If you want to choose one of the most reliable lock, it must be an additional lock. Because the additional lock stable and efficient performance of the functions over the years, has been widely used for business and residential
Select a lock to attach steel, and its security features will not let you down.
Many manufacturers have made a different design additional locks, as a necessity to protect residential and one commercial.
The design is very simple, as long as there is a bolt keys and an additional lock like a typical keyhole lock but no handle or knob. It needs to put a lock with a key lock.
Steel metal structure, makes it difficult to be destroyed. In some cases, deadbolt lock (Rim lock) is some other complex locks the most important part. One of them is known to resist lock. These locks have a deadbolt, the same design is also widely used in the padlock.