Designed specifically for use when removing and installing cassette lockrings on thru axle hubs Utilizes a 12mm guide pin to stabilize the tool in use Fits 12spline cassette lockrings from Shimano, SRAM (including 1x), SunRace, SunTour, Chris King and others (23.5mm diameter) Fits some Shimano and similar disc brake rotor lockrings Retailers are not permitted to sell on the Amazon.com marketplace unless authorized in writing by Park Tool