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.