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wqvm-
Specifically, 14 or 15mm. A bike shop will know what you're talking about but it might be worth forking out £15 for one of your own. I've lost count of the amount of times I've used mine since I bought it. Worth noting that some sockets won't fit in some cranks because the walls are too thick. Sometimes you need an actual bike-specific tool as they have thinner walls.
dglshrn
A socket wrench for crank bolts