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Screw is tiny and hard to take unless we put it in a small pocket. This design is aimed to settle this problem. We can rotate the screw out of the screwdriver and set it in something, and rotate the screw into screwdriver in case of loss.
This design makes it convenient to change suitable head of screwdriver when we are in process of work, we just need to rotary the head of handle that it can change different types of the screwdriver's head.
We can take the screwdriver easy and safe in case that the top hurts the body of carrier. Just rotary the head of the handle to the end , then the head will pinch into the body of the handle.