New a special M14x1.25 thread cleaner (chaser) with integrated seal seat milling tool. This combination ensures that the thread is cleaned and the plug seat is skimmed at the same time for better spark plug sealing. Designed for spark plug size: M14 x 1.25mm with flat sealing area. Milling head diameter 20mm . Cleaning of the spark plug seat using a compression spring with integrated flat seal seat milling tool. Manufactured from chrome molybdenum for long life. The 13mm drive hex is equipped with a spring-loaded detent ball to help hold the assembly in the socket. Length of tool 55mm NOTE: do not use on tapered spark plug seats.