The key to removing your cassette, a lockring tool is another essential piece that every mechanic needs. The Park Tool FR-5.2GT Cassette Lockring Tool with 12mm Guide Pin has a 1" base to fit your wrench or in a vise, and will fit any lockring from Shimano, SRAM, SunRace, SunTour, and Chris King. It has a 12mm guide pin that's designed specifically for use with thru axle hubs.