The FR-5.2GT is designed specifically for use when removing & installing cassette lockrings from thru axle hubs Utilizes a 12mm guide pin to stabilize the tool in use Fits 12-spline cassette lockrings from Shimano®, SRAM® (including 1x), Sun Race®, Sun Tour®, Chris King® & others (23.5mm diameter) Fits some Shimano® & similar disc brake rotor lockrings Made in the USA & covered by Park Tools legendary limited lifetime warranty