A chainlock, also known as a smiley is an improvised weapon which consists of a length of chain or strong cloth attached to a large lock or other piece of metal. The chainlock is mainly used in areas where other hand held weapons are not readily available, such as knives. The chainlock is used by swinging the heavy end of the chain at the target. The chainlock is not usually considered to be a lethal weapon, but can cause a lot of damage when used correctly. It is normally used in gang warfare.