Features:

• The rethreader is used to clean up dirty or damaged spark plug threads on
  Harley-Davidson® TwinCam®, V-Rod® and some Sportster® models.
  
• The tool consists of a special 12mm spark plug thread with a lead in and
  flutes. It also has a 5/8" hexagon with o-ring and female 3/8" square drive.
  
• The special 12mm spark plug thread ensures proper engagement.
  
• The hexagon and o-ring require the use of a 5/8" spark plug socket, or the
  female square requires the use of a male 3/8" square drive.
  
• The lead in allows for proper alignment.
  
• The flutes allow for dirt and chip relief.