Peanut butter wrench
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A peanut butter wrench is the name used in North America for a single-ended box wrench or ring spanner used in cycling to tighten cranks, or the wheel nuts (track nuts) on hubs with solid axles commonly found on track bicycles, particularly the 15 mm wrench made by Campagnolo. Crank bolt spanner or crank spanner is another name for this tool. This is the ony tool, or a thin wall socket, that can be used to tighten or loosen the bolt which holds the crank to the bottom bracket spindle, whereas any wrench/spanner of the correct size will tighten or loosen wheel nuts.
The wrench is apparently the right size and shape to scoop peanut butter (a fairly cheap energy food for track cyclists) out of the jar.
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