These are the only real way to get a completely stripped or mangled screw, bolt or stud out, even if the head has broken off completely. You simply drill a hole in what remains of the offending fastener, then use the appropriate size screw extractor with a tap wrench. They have an aggressive left-handed thread that bites into the metal, enabling you to unscrew the damaged fastener. This is the kind of tool you need once in a blue moon, but when you need them, they're indispensable.



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