Size: M18x1.5, Also works on M18x1.5 spark plug threads,

1/4-20 UNC Inch Coarse Repair Kit, 3 Inserts

Efficient and easy thread repair system, Self adjusting to any thread type from 4-13 mm, No need for calibration or identifying fastener thread type, Automatically chases good thread sections to repair the damaged parts, Nylon pads included in set to avoid marring softer metals or plastics,

1 each insert S, N, L

   Contains all the tools necessary to permanently repair damaged oxygen sensor threads in the exhaust manifold.
   Designed for ease-of-use by professional mechanics and engine rebuilders as well as do-it-yourselfers.
   Contains an installation tool and proper size inserts
   Oxygen Sensor thread replacements increase future serviceability with high-temperature Inconel inserts that eliminate the need for exhaust manifold replacement

1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13

M5.8, M6-1, M8-1.25, M10-1.5, M12-1.75

, Internal 4-38 mmOne hand tool restores inch or metric, RH or LH threads, Floating cutters are self-adjusting to any pitch and size within range, No need for calibration or identifying fastener thread type, Automatically chases good thread sections to repair the damaged parts, Hardened cutting blades,

   Designed to repair the spark plug ports in 4.6, 5.4 and 6.8 liter Ford Triton engines.
   Ensures the permanent repair of the spark plug port threads in the Triton engine
   Comes with a carrying case, piloted reamer tap, tap extension, installation tool and 8 inserts.