Features and Benefits:6 sizes include: 12x1.0, 12x1.25, 12x1.5, 14x1.25, 14x1.5, 16x1.5;Square drive allows use of standard driver;Square-to-hex adaptor allows the use of 14mm or 9/16” socket or wrench;Designed to reach the bottom thread, even with inverted flare fittings;Saves time and money � no need to remove or replace the exhaust system;Technicians will appreciate this set of re-threaders that have been designed to repair exhaust temperature sensors bungs. Because of extreme heat cycles and the corrosive environment of modern diesel exhaust systems, the EGT sensors become very difficult to remove without damaging the exhaust system. The shape and depth of the fittings are such that standard re-threaders cannot be used. These re-threaders are designed with a specific geometry that allows them to clean-up most types of damaged EGT sensor bungs and allow a new sensor to be installed without needing to replace the very expensive exhaust system. The six different sizes and one special drive adaptor that are included in the kit will accommodate repairs of most, if not all, EGT sensors used on cars, as well as light, medium and heavy duty trucks on the road today.