Yes, that's a fairly common ruler for grading wire. bigger than a pencil lead. But not all yards have the same rules.
The first main rule of scrapping is " There are no hard and fast rules". Find a couple of yards you feel comfortable with, and check out their rules about what they take or not. And what their prices are on different things you'll be scrapping.
You'll find one yard is higher priced on XX and the other yard will be higher on YY. It takes time but most of the answers are already here, just take the time to read them. And let Google be your friend also.

I have 3 main yards I call on a regular basis for regular scrap. It depends on what's on my truck as to which way I'll go.