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Park Tool HCW-5 Professional Spanner Lockring. Many derailleur chains use a "master link" that allows the chain to be installed and removed by hand. Simply insert the specially sized jaws into the masterlink and squeeze the handles.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.