The sprocket of the Rohloff SPEEDHUB 500/14 is secured to the gearbox over a six start thread. To remove the sprocket with a chain-whip, the driver must be firmly held in place. This is the job of the sprocket tool. It is placed over the driver, secured by a quick release lever (CC versions) or axle nut (TS versions) and can then be held firmly in position with a 24mm wrench.
Instructions for use can be found in the ‘service and repairs’ section of the SPEEDHUB Owners Manual.