A screwdriver for a regular 1/4" bit-holder. It has a spring locking feature to prevent the bit-holder from falling out. This is not made for short bits: they will plunge into the hole completely. The hexagon hole has a diameter of 1/4" +200µm.

I could not find such a simple thing in my local hardware store. There were only sets consisting of huge screwdrivers and bits. Probably 10€ saved. Welcome to the new world old industry.