I own a Yankee drill and one of these. The handle of the Yankee drill hollow metal to hold a half dozen different diameter drill bits.

My version of this tool came with a removable screwdriver blade. I imagine there are a variety of blades available. If you view the video @mike fleck referenced you will notice that the worker put small screws into the the neck of the guitar, then used this tool to tighten them by pressing up and down a couple of times.

So, my experience and the video of one on use tells me that this is a screwdriver.

I own a Yankee drill and one of these. The handle of the Yankee drill is hollow metal to hold a half dozen different diameter drill bits.

My version of this tool came with a removable screwdriver blade. I imagine there are a variety of blades available. If you view the video @mike fleck referenced you will notice that the worker put small screws into the the neck of the guitar, then used this tool to tighten them by pressing up and down a couple of times.

So, my experience and the video of one in use tells me that this is a screwdriver.