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4 Pieces. Includes sizes: 2,3,4,5. Used to remove broken screws, bolts, threaded parts, and pipes. With proper use, broken pieces can be extracted without damage to threads. Type 420. Made in USA.
To remove the broken threaded part: Drill a hole in the end of the broken part (left hand spiral heavy duty drills are recommended for this drilling operation), insert extractor, then turn counterclockwise using a wrench on the exposed end of the extractor.