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Long shot I know. Found in my spares box. No idea what hub they fit. Not threaded and no spanner flats. Don't think they are hope (have steps or flanges), dt (don't match the ones I have) or novatec (look wrong and not threaded). The outside diameter matches the 12mm end caps on a hub I have which suggests they are either for a rear hub or front that takes up to 12mm. Any ideas?
They look very much like Hope rear hub to me but I take your point about them not being stepped.
That was my first thought though all the hope pictures seem to show the drive side as silver not black (and the step).
Easton Havoc?
That does look like a likely candidate.