A chain lock is one of those locks, usually used in hotels and homes for added security that is connected to the wall by the door and strung across the crack between the door (the side with the knob) and the wall.
On the door there is a track that the knob on the end of the chain slides in. When the door is opened with the lock locked it is held back by the chain leaving a minimal amount of room allowing things to get through.
This opening can be taken to YOUR advantage when you use the extremely simple device that you will be taught to make.
You will be provided with complete details on materials, and other tidings that would aid anyone to pick the chain lock.
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