Apart from the extra
it allows the screw to be
driven with a continuous movement.
This avoids the jerky turning
movement of a normal hand
driver, however care needs to be taken not to over torque the screw and
the head off.
has the best of all worlds, however you need to take care not to allow
to wander off.
Philips, Posidrive and
other cross headed type
drivers and screws have become quite widespread.
These give a better grip on
the screw head for fast
driving, however there are several types and you must use the
driver head each type of screw.
Once damaged, there is little
that can be done to repair
either the screw or the driver.
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