Exactly the same as any other nut. Spanner is just British terminology for wrench.
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How to calculate spanner size regarding bolts and nuts
The spanner is bent at an angle so that it can easily applied or hold the grip of any 6 sides of nut to achieve the maximum mechanical advantage by moving the handle to and fro in the shortest possible space.
A hexagonal nut has the shape of an equilateral hexagon
20 Nm. You just multiply them together.
The plural of nut is nuts. As in "I would like a bag of mixed fruit and nuts".