I keep this set in the bag bag with my Makita impact driver. It has the most common size drill/countersink with the right bit on the other end for driving screws. It is a very handy set to keep with your impact driver.
The original quad driver had hard to remove bits when they broke. This new version has easily removed bits & the bit holder. No extra tools are needed or can be lost, since the allen key is built in to the body of the tool!!!