Park Tool Fr-5 Cassette Tool.
sprocket / HG Lockring puller with 1 "base for open-end wrench
Made from hardened tool steel, very slim designed, 12 teeth, 23.4mm diameter
Fits Shimano®, SRAM®, SunRace ®, SunTour®, Chris King® and other closure rings
The sprockets must be maintained against a chain whip, eg Park Tool SR-1, SR-2 or HCW 14
To secure the tool always a quick bum or Vollachsenhsen share the axle nut
heat treated alloy tool steel, one inch base fits wrench or bench vise
Thin wall construction Allows use without removal of cones and locknuts < br> Fits Shimano®, SRAM®, SunRace®, SunTour®, Chris King® and other cassecassette lockrings.
The FR-5 has 12 splines are indeed Approximately 23.4mm across
So fits Shimano disc brake 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 groove nut
