Problem with those, they generally are of poor quality, the threads arn't cut right, cross threading is easy when using the poor quality materials, i expect they are also zinc coated rather then stainless.
but a good find for those on a budget..
If however you need some serious fixings for components i would strongly advice checking out this store.... you have all seen me use things from here before on builds...
Prices quite reasonable in my opinion but as the saying goes you get what you pay for.
I'm Not Anti-Social, I'm Anti-Stupid.