Originally posted by Tavis426:To your first statement, I have to disagree. With a 6-point, every square mm of bolt head surface is touching wrench. How is that not better?
this is what in fact happens: I might have excagerated the difference in sizes, but you gut the idea. you don't apply pressure to six sides, you actually apply pressure to six edges -- which is why in fact you round off bolts if you are not careful.
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To your second statement, are you talking about line wrenches, like for brake lines and whatnot?
this is the one (craftsman 5" 15mm combo wrench va-47957): so you see what happens: the outward arch of the lower side pushes on a sides of a bolt, rather than on the edge. in theory at least. i don't see these wrenches in craftsman catalog anymore, so may be they were not that popular. I have mine and it actually works no worse than any open end
