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I thought so too, M9 probably but unfortunately my calipers are out of battery and I don't have any non digital ones. Looking on the scale which is only in mm increments, it looks between 9 and 10mm so it might be standard imperial Brompton after all. I'll buy some stock Brompton ones and see if they go on and if not I'll get some M9 track nuts on order
PhilDAS
They’re made in Taiwan by a good Taiwanese company, I rate them highly. I’d wager the threads are ISO metric vs. Brompton’s imperial crap. No idea why it was so cheap, but if it’s as good inside as it looks on the outside, I expect you’ll be pleased with your purchase soon enough.
I’ve found sending them a message via their website is effective; you can ask them, if you don’t have a thread pitch gauge and/or can’t confirm the sizing online.