The E3 Premium Automotive Spark Plugs are a high-quality option for your vehicle, available in a 4-pack. These spark plugs feature a ceramic top material and alloy steel core for durability and efficient performance. The thread size is 14mm x 1.000', designed to fit a variety of import and domestic applications. With a fixed gap that cannot be adjusted, these spark plugs are equipped with a DiamondFIRE tip for improved combustion. The resistor feature helps protect against radio frequency interference. These spark plugs are easy to install with a 5/8" hex size and come with a gasket seat. The part number for these spark plugs is E3.68, and they are brought to you by the trusted brand E3 Spark Plugs.