Although some brands may have slightly different designs, all screwdriver bits have the same basic parts:
Screwdriver bit tip
The tip of the screwdriver bit is the part that engages with the screw’s drive when inserting or removing it.
There are many different designs of tip, to match the many different designs of screw drive.
Screwdriver bit shank
The shank is the part of the screwdriver bit that fits into the power tool’s chuck.
All screwdriver bits have hexagonal-shaped shanks with six equal sides.
Screwdriver bit torsion zone
Some screwdriver bits have a torsion zone between their shank and tip.
Manufacturers of these bits claim that it acts as a shock-absorber when a lot of torque is being applied, so the screwdriver bit can be used for longer before it needs replacing.
Providing the chuck is the correct size, screwdriver bits can fit into: