A chain rivet extractor is a tool used to remove the pin on a roller chain so you can shorten or lengthen it during repairs or adjustments. Chain rivet extractors are available in different configurations suitable for various sizes of chain pitch.What are chain rivet extractors used for? Chain rivet extractors are normally used for roller chains and bicycle chains. These chains are also found in the food, mining, automotive and agricultural industries.How do chain rivet extractors work? Most chain rivet extractors use a screw-operated mechanism to remove pins from a roller chain. They typically feature a cradle that can be used to either partly or completely remove a pin from the chain, or to loosen tight links.For repair, shortening or elongation purposes, you would insert the chain into the cradle, ensuring the pin of the extractor hits the rivet of the chain. You would then turn the handle of the chain extractor all the way through until it extracts the pin of the chain, so thatyou can take it apart.