Product Description For Shimano cassette lockring - the sprockets must be fixed with a sprocket removal chain (SR-1/11, SR-2 or HCW-14). The tool also fits some retaining rings for Shimano brake rotors. Compatibility:Shimano freewheelsSRAM freewheelsSunRace freewheelsSunTour freewheelsSunTour freewheelsFeatures:12 slots23.5 mm diameterManufacturer Number:FR-5.2 Contents:1 x Manufacturer: Park Tool Company 1185 Eagle Lake Rd Shoreview MN 55126 USA info@parktool.com Distributor: GROFA Action Sports GmbH Otto-Hahn-Straße 17 65520 Bad Camberg Germany info@grofa.com