Park Tool FR-5.2 Cassette Lockring Tool General That means

That means

When you're replacing gear and brake cables

Use Shimano lock ring tool for installation

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Park Tool FR-5.2 Cassette Lockring Tool General That meansDesigned for 12 spline 23. 4mm diameter tool fittings the most common tool fitting found on 7 12 speed cassette lockrings, and can also be found on some disc brake lockrings and Rock Shox suspension fork top caps. Made from heat treated alloy tool steel. Thin wall construction allows use without removal of cones and locknuts. Specifications Fits 12 spline cassette lockrings from Shimano, SRAM (including 1x), SunRace, SunTour, Chris King and others