Park CT-3 Screw Type Chain Tool
Made from investment cast tool steel. The CT-3 features a handy "loosening shelf" to remedy stiff links after reassembly. The fine thread and comfortable size enable easy removal of even the toughest chain rivets. Like all Park Tool Chain Tools, it's easy to use and built to last, and has a replaceable driving pin. Works great on derailleur chain, even 9 and 10-speed chains.