Top quality screw extractor kit. Twist extractors to remove broken studs, pipes, set screws, grease fittings etc... Special reverse left handed threaded sockets. This precision kit allows you to extract hexagonal bolts which are corroded or seized and need to be removed without damaging the casing or thread. Manufactured from cr-mo hardened steel for maximum durability. Will easily bite into and grip the softer bolts. For use with a socket or spanner. Sizes 9mm / 10mm / 11mm / 12mm / 13mm / 14mm / 15mm / 16mm / 17mm & 19mm. Box comes with space for nut removal bar (not included). Supplied in a blow molded case for easy storage and transportation.