Many derailleur chains use a "master link" that allows the chain to be installed and removed by hand. While this type of masterlink doesn&';t require a traditional chain tool, over time, dirt and corrosion can make it difficult to separate by hand. The Park Tool MLP-1.2 Master Link Pliers make removal and replacement of these masterlinks quick and effortless. Simply insert the specially sized jaws into the masterlink and squeeze the handles. Specifically designed to quickly and effortlessly remove and replace masterlinks Just position the pliers around the pins of the masterlink, gently squeeze, and the MLP-1.2&';s will press the pins together for an effortless chain removal Comfortable double-dipped handles Tough, shop-quality build Made out of steel