We need to see the other side, but my guess is 108mm ISIS. You are about to find out why the cranks were cheap :-)
If they're the same as the apparently identical ones I've got they're square taper, and take a 103mm BB for a 42mm chainline.
@Brommers started
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If they're the same as the apparently identical ones I've got they're square taper, and take a 103mm BB for a 42mm chainline.