Park Tool MLP-1 Master Link Pliers
Many derailleur chains use a "master link" that allows the chain to be installed and removed by hand. While this type of master link doesn't require a traditional chain tool, over time, dirt and corrosion can make it difficult to separate by hand. MLP-1 Master Link Pliers make removal and replacement of these master links quick and effortless. To use, squeeze side plates together, insert the specially sized jaws into the master link and squeeze the handles.