Thread: 12 mm, Reach: 3/4". Champion Ref #: RA8HC, RA8HC. NGK Ref #: DC9A, DCPR7E, DCPR7EX, DCPR8E, DCPR8EIX, DPR7EA9, DPR7EIX9, DPR7EVX-9. Sold each.

• Unique electrode shape maximizes the power created by the spark plug - Diamond Fire technology
• Electrode is a combination of performance and technology that results in an improved flame kernel shape
• The result is more complete combustion and an improvement in engine performance
• This flame front ignites the bulk air/fuel mixture faster, moves heat into the combustion chamber faster and creates a more localized pressure front for faster pressure rise during the cylinder power stroke