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POWERCOIL is the original spark plug port thread repair. These kits offer the highest quality and most durable repair available. The first choice of professional mechanics and engine rebuilders, POWERCOIL wire spark plug inserts are available for any engine. Kits are available in sizes M10, M12, and M14. Each kit contains a piloted tap(no drilling necessary), an installation tool, and a quantity of inserts. The M10, M12 and M14 kits contain several inserts lengths to accommodate all spark plug reaches. POWERCOIL Spark Plug Inserts are the preferred method of repair specified by virtually all U.S. and foreign vehicle manufacturers.