Used to clean up dirty or damaged spark plug threads
Consists of a special 12mm spark plug thread with a lead in (for proper alignment) and flutes (for dirt and chip relief)
Also features a 5/8in. hexagon with O-ring and female 3/8in. square drive;
Requires the use of a 5/8in. spark plug socket, or the female square
Requires the use of a male 3/8in. square drive
Special 12mm spark plug thread ensures proper engagement
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