A screwdriver screws or unscrews, manually or powered. Additionally, screwdrivers typically have a handle and a shaft. Also ending in a tip, which the user puts into a screw before to turn. The shaft tends to be made of steel, as to not have it bend. Additionally, a nut driver tighten nuts and bolts. Generally a hollow shaft to accommodate a shank is present in the tool. Evidently, nut drivers fair better in lower effort applications.
