Hi. I’m a girl and so this maybe a really girl sounding question. But I’m trying to get myself aquatinted with tools and how they work since I have no man around the house at this point. And I’m pretty good at doing small jobs for myself.
So, that said, is this one driver with just one 7mm head that is not interchangeable. I’m just going by the description and how solid the shaft appears in the pictures. Thanks 
You are correct, it is just the one.
Thank you. That seems like it wouldn’t be as useful as an interchangeable ratchet would. Not unless everything you had to use it for was 7mm and/or on really long screws. 