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I did a quick test and a gentle tap with the end of ascrewdriver was all that was needed to get these to "grab". Note that the photo is from the "old style" box(the new style box is three rows of extractors). These are nice. Near as I can tell,these are identical to the set sold by Snap-On for about $100. Now, no extractor can remove a bolt that's so corroded that the headshears off when you try to turn it, but for situations where the bolthead "died" or broke off because you turned it too far, or for pipenipples and other tubes that have no exterior wrenching surface, these are theperfect tool.Note that these are relatively short, so if the bolt/nipple is more than1/4" below the surface, these might be too short and you may need to usea numbered spiral remover, but these have more grip because they havemany more splines than a spiral remover.You can also use these to remove allen and Torx screws that have had theirsockets chewed away. The flutes are *sharp* (which is good to get a good grip without expandingthe hole).
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