The shaft is usually made of tough steel to resist bending or twisting.
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A screw drive is a system used to turn a screw.
At a minimum, it is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. Usually, it also involves a mating tool, such as a screwdriver, that is used to turn it.
The following heads are categorized based on commonality, with some of the less- common drives being classified as " tamper- resistant". A screwdriver is a tool, manual or powered, for screwing and unscrewing ( inserting and removing) screws.