Just like the aluminium wheel nuts, nice to have and very light. Although titanium is nice and makes people dribble, its unnecessary
I like the way they are flanged, but have a look on Ebay for much cheaper options in packs. Your local fastener company might have something similar. I wouldn't think that there will be much difference in weight once you shave the head and reduce the socket size, probably talking a few grams over the whole set of wing bolts
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