Application :
For extracting jammed or broken screws, nuts, and bolts. Suitable also for round-head and socket-head screws.

Version :
Made of tough chrome molybdenum steel. The sharp edges of the flutes bite into the jammed or broken screw / nut and bolt and allow it to be unscrewed. For use in combination with a ratchet, T-handle etc. Also suitable for round profiles or hexagon socket head screws.