What kind of nuts do I get?

So I was looking for nuts on a hardware store but they have all sorts of nuts and i don’t know what to choose… Please help me!

what do you want them for?

Well there are peanuts, almonds, cashews…OHHHH :wink: those nuts, um well i would take the axle with me to the store when buying them to make sure its the right size / shape

Oh… OK… But what specifically should I buy though?