TYPES AND USES
Screw extractors are used to remove broken screws
without damaging the threads or surrounding material.
There are two basic types of screw extractors, the
straight-flute type and spiral-tapered type.
The straight-flute type requires the following tools to drill
a pilot hole in the screw: a twist drill (1), a drill guide (2),
and a turn nut (3).
The spiral-tapered type requires a twist drill for drilling a
The tap extractor is usually of the flute type and requires
the use of a wrench to turn the tap. It is used for remov-
ing taps with no external area.