Square shank is designed for use with spanners etc For user convenience Manufactured with a job-specific grade of steel designed to withstand Flex and high torque loads experienced during operation. Left hand thread allows screw Extractors to be inserted into broken screws or studs and turned anti-clockwise to extract Screw Extractors are ideal for extracting: broken screws, broken bolts, broken studs & Rounded Off screw heads, Manufacturer: Armeg