Autolite App26 Double Platinum Automotive Replacement Spark Plugs (4 Pack) Head each stud is centerless ground

each stud is centerless ground to make it as close to perfectly concentric as possible

Now you will no longer have to worry about these issues

000 mile limited manufacturer tread life for P/E-metric sizes

you can depend on them not to discolor or deform even around the craziest of curves

all critical for maintaining engine performance

Autolite App26 Double Platinum Automotive Replacement Spark Plugs (4 Pack) Head each stud is centerless groundAutolite Double Platinum Spark Plugs have better materials to give your engine better performance. Platinum to platinum design greatly decreases gap erosion, reduces misfires, and provides improved durability compared to standard plugs. It's the superior performing spark plug, providing preferred technology for DIS engines. 5 year limited warranty