Autolite HT15 Platinum High Thread Spark Plug, Pack of 1 Platinum fine wire tip provides improved fuel efficiency, lower emissions and improved horsepower with virtually no gap erosion Patented, OE Design provides consistent optimal performance One-piece ground shield strap for improved heat transfer High Strength Steel technology to make replacement easy with special socket tool Designed specifically for Ford 4.6L, 5.4L and 6.8L 3-valve engines