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I need to replace my bleed nipples on my calipers.

They're a 7mm spanner, although some are 8mm but that might be just crap on the nipple.

Was wondering what size they are, as there appears to be a number of different sizes/thread pitches available?

Doesn't matter, I appear to have found my answer

within 30 mins even haha, but the 7mm spanner size is stock, dunno about the thread.