These are a hardened sharpened conical reverse tap with a small tip, designed to bite into the damaged screw head so it can’t cam-out.

IRWIN 1876224 Impact Performance Series Grip Double-Ended Screw Extractor Insert Bits, 3-Piece
4.0

5PCS Damaged Screw Extractor Set, Upgraded Model HSS 6542, Hardness is 63-65HRC, Screw Grab Screw Removal Tool, Adult Gifts for Men, General bit Set Double...
4.0

SKmoon Damaged Screw Remover and Extractor Set , Made From H.S.S. 4341#, the Hardness Is 62-63hrc ( Set of 4 )
4.0