Working principle:

wire breaking out the direction of the thread and the screw nail thread direction is reverse, when the inverse clockwise screwing when, broken wire extractor is continuously to the inner hole tighten and reaches a certain tight degrees screw rotate along with, because it is in the opposite direction rotation screw will naturally turn out.

Method of use:

first choose a than thin twist off screw broken wire extractor, to find a bit of a broken wire instrument for removing the thin end of the same size and in the broken screw middle drill a hole deep enough. Then use the broken wire extractor counterclockwise screwed into the bend screw, screw is screwed out until the break.

also, in hex (or outer hex bolt hex head screw and unscrew failure, also can use this way.