[Ron Ramirez]

Do you mean for tuning or for the bandswitch?

The tuning knob is a large hex knob with a setscrew to allow for pulling out the tuning shaft and pushing it in to change tuning speed.

Now, I've seen some of these with a medium hex knob on the bandswitch (same as on the off-on-volume and tone control shafts), but most 16 sets I have seen which use hex knobs have a large hex knob on the bandswitch as well.