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Many derailleur chains use a 2-piece puzzle-style master link that allows the chain to be installed and removed by hand. Generally this type of master link won't require a traditional chain tool, but over time wear, dirt, and corrosion can make it difficult to separate by hand. The MLP-1.2 Master Link Pliers make removal and replacement of these master links quick and effortless. Simply insert the specially sized jaws into the master link and squeeze the handles.