Irwin Tools 53645 Straight Flute Screw Extractors, 6 Piece Set
The Irwin Tools 53645- 6 Pc. Set (1-6) Straight Flute extractor set is designed for softer materials or thin-walled pieces such as pipes and fittings.  The esign eases extraction because it does not expand the material as you remove it.  The straight extractors also allow a user to extract a broken left handed fastener with it's ability to go in both directions.