That driver looks more Goodell-Pratt than North Bros. to me; but more likely some other brand altogether. I'll need to look; seems to me I've got a similar-looking tool in my shop.
K-D's still in business, but doesn't seem to have a website. You could stop in to your local auto parts store, find a K-D product, and see if there's company contact information on the package; and then ask them. Clearly, it has something to do with tubing. As you probably know, K-D is mainly automotive, so this could be brake-related, or ??
Not a bad price, 50 cents each.