Park Tool Cassette/Rotor Lockring Removal Tool - FR-5/FR-5G Fits Shimano, SRAM, SunRace, SunTour, Chris King and other cassette lockrings. 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.