The Park Tool FR-5.2H Cassette Lockring Tool w/ Handle is a professional-level tool with a long sturdy handle for easy removal of cassettes and disc brake lockrings. A large passthru hole allows the FR-5.2H to be used even when quick-release skewers are still installed. This standard-size of cassette tool fits most 7-12 speed cassettes. Specifications: Outer Diameter: 23.4mm (Approximate) Center Bore (For Axle Clearance): 20mm Splines: 12 Tool Length: 25cm (9.8") Compatibility: Fits 12-spline tool fittings with an approximate outer diameter of 23.4 mm Fits cassette lockings from Shimano, SRAM, SunRace, SunTour, Chris King, and more Fits disc brake lockrings and locking adapters with 12 internal splines (Shimano type) Fits top cap of some RockShox suspension forks including Pike, Lyrik, SID, Revelation, Reba, and Paragon