A ratchet screwdriver must be able to turn screws in both directions. It must also have a handle that is adjustable so that it can be used for different sized screws.
A ratchet screwdriver is used to tighten screws. It has a handle that can be turned in either direction, which makes it easier to tighten screws.
Passion for tools. I like to build, but above all to use tools. They are great feats of engineering and human inventiveness.