Extron, one of the major commercial manufacturers, often includes a small screwdriver, which we all call 'tweakers' in the business. Look up 'Extron Tweakers' to see them, and to see what people do with them artistically.
Extron used to include them in EVERY single product they made. They used to include so many that they would have a art contest for the best use of the little screwdrivers. I have a Extron shirt that reads "Manufacturer of tweakers and other fine products" with a closeup view of the little screwdriver.
Anyway... the size of the flat head is appropriate for the phoenix connectors used on their products, and is also the right size for use on the banana plugs. It's like a #1 flat head or something like that. I actually have a Rigid screwdriver set that works much better due to the overall build quality that I typically use, but I have about 100 tweakers that I can grab (and lose) whenever I need them.