Park tool mini brute chain tool ct 5this 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 featuresworks on derailleur chain including 5 6 7 8 9 and 10 speed chains the ct 5 works on any derailleur chain including hyperglide and has a shelf for loosening tight links the ct 5 is about 60mm tall 55mm wide and 15mm thickweight 75gbuy pa