Features: Easy to use. Extractors have round flutes. High quality group of pillar extraction apparatus through our professional Anti clockwise twist design. Broken bolt or screw drill, then extractor insert. Usage: Choose the appropriate screw extrator into broken wires conduit, use adjustable wrench counterclockwise move, tightens the broken wires at the same time, broken wires along the extrator and twist, note extrator and silk thread without injury to the pipe. Package Included: 1 X Set (8pcs) Screw Extractors