A ¼ Inch hex drywall screwdriver is a specialist tool used for screwing drywall into wooden battens. 

The most important difference between a drywall screwdriver and a standard screwdriver is that a drywall screwdriver will feature an adjustable depth stop. The depth stop enables you to consistently screw drywall to the wooden batons at the same depth. This is important so that the screws do not go too deep into the drywall, causing it to be poorly secured.

It is also possible to use a drywall screwdriver for some other general applications too, if needed.