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Older style of chain, with 1" pitch. This type of chain has the same number of rollers as a similar length of normal 1/2" pitch chain, but they are spaced alternately close together and far apart. Every other roller engages a sprocket tooth. This type of chain was in common use up until around World War II. See also block chain.
An 8-tooth sprocket for 1" pitch "skip link" chain (left) is equivalent to a 16 for standard 1/2" chain.
