M12 X 1.25 Time-Sert Spark Plug Thread Repair Kit This kit includes: Step Tap,Wrench, Seat Cutter, & Insert Driver Inserts are not included. Inserts are available separately in a variety of lengths. This extremely high quality kit contains all tooling needed to perform the repair! Why replace your cylinder head when AT LAST there is a permanent, reliable repair? Complete Instructions Included! Kit comes in a durable plastic case!