Park Tool CT-5 Mini Chain Brute Chain Tool: This small 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.