Top quality screw extractor kit. Special left hand reverse thread extractors to remove broken studs, pipes, set screws, grease fittings etc... This precision kit allows you to extract 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. Drills manufactured from HSS 4241. Various size ends so will fit any ratchet / extension / spanner /socket etc... Extractor sizes: 3-6mm / 6-8mm / 8-11mm / 11-14mm / 14-18mm & 18-25mm. Drill sizes: 1mm / 2mm / 3mm / 4mm / 5mm & 6mm. Supplied in a blow molded case for easy storage and transportation. Simple to use: Drill a pilot hole in the fastener. Choose a suitable bolt extractor and insert it into the hole. Use a wrench to turn the bolt extractor anticlockwise to remove.