Park Tool FR-5.2 Cassette Lockring Tool
A lockring tool made by Park Tool, item FR-5.2, for the 12-spline fitting found on most 7 to 12-speed cassette lockrings, including Shimano, SRAM, SunRace and SunTour, and on 12-spline disc brake rotor lockrings. It has a 12 mm center bore for axle clearance and a 1-inch hexagonal base for a wrench or socket.
Text from OyList

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