The Park CT-4.2 Master Chain Tool is one of those tools that, once in hand, becomes a favorite. The CT-4.2 is designed to work with all 8,9,10, and 11-speed chains with an "hourglass" side plate profile. This means that it can be used with nearly anything you can get your hands on, be it Campy, Shimano, SRAM, KMC, etc. The investment cast steel body will last a lifetime and the handles are ergonomically shaped to provide comfort. The rivet pin rotates in place so that installations are smooth and precise. The pin is also replaceable should it become worn or damaged.
The Park CT-4.2 Master Chain Tool is not compatible with Wipperman chains due to their non-hourglass side plate shape. They simply will not fit into the tool.