This cassette lockring tool from Park Tool is an essential tool for the fitting/removal of your cassette and can also be used to fit and remove centre-lock brake discs. Fits Shimano, SRAM (including 1x), SunRace, SunTour, Chris King and other cassette 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. This has been constructed with heat treated alloy steel with a one-inch base that will fit a wrench or a vice. The thin wall construction will allow you to use this without removing the cones and locknuts for extra convenience. It will also fit some disc brake lockrings giving this a tool multipurpose use. 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-5.2 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.