Two of these go onto the driver along with the sprocket and the sprocket dust cap.
The spacers may be re-arranged to allow you to fine-tune the chain line.
These spacers are also sometimes used under the fixed cup of a bottom bracket, or under a thread-on freewheel or track sprocket, to correct chainline or other problems.
Click here for a parts diagram of the Sturmey-Archer AW hub.
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