Cast Iron bar is used widely in a wide range of sectors such as the glass, automotive, machine tools and oil and gas industries. Typical applications include pistons, valve bodies, moulds, dies, cams, gears and pulleys.
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I know this is an old question but it was top in my search results, so I wanted to better answer it and get a little more to the point. It doesn't matter how many subscribers you have, it matters how many views you get. YouTube typically ranks earnings in RPM which basically means x numbers of dollars per 1000 views. The average RPM based on my findings is somewhere between 2-3 dollars per thousand views.