Solid 4 link bars?

Thanks Hemidenny got it, i was just curious ,i thought of it as...

If you can bend rebar, being solid metal although its smaller in thickness, wont a 2" solid bar be bent with the weight of a truck on it? His had ends on it that were threaded into the bar. I was just thinking why not thick walled tubing?

What are the differance of heim ends and standard rod ends?