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http://www.wiggle.co.uk/race-face-chain-ring-bolts/#itemtop
Wiggle helpdesk says these though:
http://www.wiggle.co.uk/id-chainring-bolts-set-of-4/ (single 6.5mm)
Whereas the top one doesn't give any indication of size.
Or recommend other ones? 🙂
Just use a set for single chainring thats what i did or if you have a vice just file the one you have.
Yeah the 6.5mm
Cutting / filing them down doesn't always work. Some including my Raceface ones from a triple weren't threaded all the way through so by the time they were cut to length there was not enough thread left.
I ordered some single ring ones from Charlie the bike monger and used cut down washers on the front face of the crank tabs temporarily until they arrived.