I think the crank bros ones are pretty slim, and cheap now if you can find them in stock anywhere.
The SS ones are soft and will fail even when to correct tools are used and the "C" (bearing steel) ones rust easily.
I looked for them when building my light Salsa Singlespeed MTB and couldn't find them particularly cheap.
@Emyr started
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I think the crank bros ones are pretty slim, and cheap now if you can find them in stock anywhere.