Designed to work with the tight tolerances and narrow profiles of 10 to 12-speed chains, but also works on all other derailleur, and standard 1/8 width single-speed chains. The CT-4.3 is a powerful, precise tool designed to quickly and accurately remove and install chain rivets. Without a doubt the most accurate chain tool weve ever built

Note: the CT-4 is NOT compatible with Wipperman chains due to the shape of the chain side plates; most chain side-plates are shaped like an hour glass, however Wipperman chains have straight side-plates so they will not fit in to the tool