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A normal screwdriver requires the screw head slot to be in good condition to turn. When the head is stripped or the metal is rusted, the screwdriver slips. There is no grip possible.
The extractor works in reverse. Instead of relying on the screw head, it drills into the metal and bites into it. The more you turn to remove the screw, the more grip it creates. The extraction force increases with movement, it is not lost.