The Performance Tool W83164 Spark Plug Rethread Kit is designed for repairing damaged or stripped spark plug threads. This kit includes the necessary tools and components to rethread 14mm spark plug holes, allowing you to restore proper thread engagement and ensure a secure fit for the spark plug. The kit includes a tap, an installation tool, and several replacement inserts. The tap is used to clean and re-cut the damaged threads, while the installation tool helps insert the replacement threads into the hole. The inserts are made of durable materials to withstand the high temperatures and pressures associated with spark plug operation. The Performance Tool W83164 Spark Plug Rethread Kit is a valuable tool for automotive enthusiasts and professionals to maintain and repair spark plug threads. Features: Designed for repairing damaged or stripped spark plug threads Includes tap, installation tool, and replacement inserts 14mm size for compatibility with standard spark plugs Durable materials for long-lasting use Specifications: Brand Performance Tool Model W83164 Thread Size 14mm