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Yes that's right, you reverse the drill when using them so from my experience it makes them ideal when drilling out a screw from a blind hole in the hope it might start it un-screwing. In the same way a normal (clockwise) drill bit stands a chance of 'pushing it through' an open hole as you drill it out.
Of course you can still try an 'easy out' style screw extractor if it hasn't shifted the broken screw or simply keep going up in size until it is clear and you can repair the thread another way.
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