A set of 6 short series thread chasers to restore exhaust sensor port threads including; exhaust gas temperature (EGT), NOx (Nitrogen Oxide), oxygen (O2) and particulate sensors prior to fitting the new sensor. Manufactured from chrome molybdenum with a Titanium-Nitride coating for hardness, rust resistance and longevity. Supplied in an EVA foam tray, designed to fit roll cab drawers, keeping the sockets clean, tidy and ready for use.