Caver-X--you might want to check at a different Lowes, honestly...the one near me stocks metric grade 8.8 and even a few 10.9's in common sizes, which are more than strong enough. If you don't have the local option, though, McMaster-Carr is good stuff, though...just don't get too wrapped up in their catalog, you'll want everything!

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Vikram/gothamist -- MAXC member
http://www.4x4LO.com