The screwdriver's a device specifically designed for the insertion and tightening of screws. The screwdriver's made up of a head or tip, which engages with a screw, a mechanism to apply torque by rotating the tip, and some way to position and support the screwdriver. A typical hand screwdriver comprises an approximately cylindrical handle of a size and shape to be held by a human hand, and an axial shaft fixed to the handle, the tip of which's shaped to fit a particular type of screw. The handl… (More on Screwdriver)