Upgrade your vehicle's ignition system with these high-quality Splitfire SF6E Copper Spark Plugs. Designed to replace SF6D spark plugs, these plugs are made of durable copper material and have a thread diameter of 14 mm. They come in a standard configuration with a hex size of 13/16 inches and have a voltage of 12 V. These spark plugs are perfect for gasoline fuel types and have a performance part that ensures optimum ignition. The installation depth is 19 mm, and they are compatible with BPR5E, SF6D, 90910-01051, and 65 interchange part numbers. The OE/OEM part numbers are 98079-55846 and 90919-01051. Manufactured in the United States, these spark plugs are a great addition to your car or truck.