Our spark plug service kit includes the Precision Gap gapping tool which is easy to use, features fine thread adjuster and ball pressure tips, and works on all massive electrode plugs. Also includes the 18mm Thread Cleanout Tool with spring loaded jaws which offer maximum thread penetration and control carbon buildup in threads. Completing the Kit is a doubleend Gap Plug Gauge which features an aluminum handle and is easy to use. Kit comes complete with a durable birchwood storage case.