The Park Tool CT3.2 Screw Type Chain Toolis made from investment cast steel, because of the tremendous force needed to remove chain pins. Along with superior strength and durability, 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 pins. Like all Park Tool Chain Tools, it's easy to use and built to last. Park Tool CT3.2 Screw Type Chain ToolFeatures Made from investment cast steel for strength and durability Fine thread and large T-handle gives high leverage, and means easy removal of chain rivets Includes a loosening shelf to release stiff links after assembly Replaceable driving pin head Works on most bicycle chains, including 10-speed