The Park Tool Cassette Lockring Tool (FR-5.2) is designed for 12 spline 23.4mm diameter tool fittings. The FR-5.2 is most commonly used on 7-12 speed cassette lockrings. Made from heat treated alloy tool steel. Thin wall construction allows use without removal of cones and locknuts.

• Fits 12-spline cassette lockrings from Shimano, SRAM (including 1x), SunRace, SunTour, Chris King and others
• Fits most disc brake lockrings with 12 internal splines from Shimano and other brands
• Fits the top cap of some Rock Shox suspension fork models including Pike, Lyrik, SID, Revelation, Reba, and Paragon
• Hex-shaped base of tool fits 1″ (25.4 mm) socket or wrench
• Center bore for axle clearance is 12mm
• Always use a skewer or axle nut to hold tool firmly in place during removal and installation