Metric Stud Extractor Set for the safe removal of manifold/exhaust type Studs. Could also be used for snapped bolts providing you still have enough thread/bolt to grip. PLEASE NOTE: These Extractors are designed to be used on FREE (NOT Seized) Studs. Anybody lacking in experience of removing seized Studs should get professional help from time served highly experienced exhaust fitters/motor technicians. Great care should be taken when using these extractors as incorrect use will cause damage to the tool and or studs! This is not to say they will not extract seized studs but great care and experience is needed to avoid any damage.