A chain is a series of connected links, usually made of
metal.Chains are usually made in one of two styles, according to their intended use:Those designed for lifting, such as when used with a
hoist; for pulling; or for securing, such as with a
bicycle lock, have links that are
torus shaped, which makes the chain flexible in two
dimensions.Those designed for transferring power in machines have links designed to mesh with the teeth of the
sprockets of the machine, and are flexible in only one dimension. They are known as
Roller chains.
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