Our easy-to-use 16-piece spark plug wire repair tool set is a great helper for repairing damaged spark plug wires with size M14 x 1.25mm, extending the life of spark plugs. The tool set comes with spark plug wire inserts in different sizes for different jobs. The included tap allows you to enlarge the spark plug hole to fit the sleeve. The tool set is made of high quality steel for high strength and durability. Additionally, all parts come in a blow molded case for easy transportation and storage.