Every work shop needs one of these Park Tool have developed a precise&44; powerful tool to quickly & accurately remove & install chain pins Specially designed to work with the tight tolerances & narrow profile of 10-speed chains & most high quality derailleur chains Integrated Link Pocket to ensure precise alignment during use Replaceable&44; rotating pin Perfectly contoured cushioned handles Precisely machined investment cast body & components Note: the CT-4 is NOT compatible with Wipperman chains due to the shape of the chain side plates&44; most chain side-plates are shaped like an hour glass&44; however Wipperman chains have straight side-plates so they will not fit in to the tool