The Park Tools CT 5 Mini Chain Brute Chain Tool goes anywhere and actually performs like a shop quality tool. The fine thread, special V shaped handle, and super strong replaceable pin make chain removal and installation a breeze. The CT 5 works on any derailleur chain and has a shelf for loosening tight links. At only 77 grams, it's the perfect take along chain tool. 10 speed chain compatible. The most effective and durable mini chain tool that you'll ever use. The current CT 5 is designed to push the chain rivet from the chain side plates. If you do not want to push the rivet out, turn the handle only 5 complete turns with 9 and 10 speed chains. Park Tools website has tutorials on how to use this product properly.