I'm going to talk to you a little bit about large diameter circular knitting.
When you use a really, really long needle like this one, you use it in exactly the same way as you would a shorter circular needle.
So you're going to be knitting around and around and around with the tail signifying the beginning and end of the round just the same way as you would something very, very long.
You can also use large diameter circular needles to knit flat things.
So this is a shawl that I'm knitting on a super long circular needle that is not in the round. I'm just knitting back and forth on it. But this kind of project, obviously, couldn't fit all scrunched up on to a straight needle. This is another reason for keeping a lot of large diameter circular needles in your needle stash.
And that is the basics of how to knit with a large diameter circular needle.