Park Tool Cassette Lockring Tool - FR-5
Heat treated alloy tool steel, one inch base fits wrench or bench vise. Thin wall construction allows use without removal of cones and locknuts. The FR-5 has 12 splines that are approximately 23.4mm across.
Fits Shimano®, SRAM®, SunRace®, SunTour®, Chris King® and other cassette lockrings
Fits the SRAM® XX1® 11-speed cassettes
Also fits Shimano® disc brake lockrings
Always use a quick release skewer to hold the tool in place and snug to cogs when loosening; For solid axles, use the axle nut