E3.56 E3 Premium Automotive Spark Plugs 100,000 Miles or 5 Years Warranty E3.56 is a 14mm, 0.750" reach plug with a gasket seat. It fits a wide variety of late model applications, especially import. E3 automotive plugs have three legs securing the DiamondFIRE electrode to the shell. This allows for excellent heat transfer and helps to create more turbulence in the cylinder. The patented DiamondFIRE side wire is proven to increase power, reduce fuel consumption and improve hydrocarbon emissions in long-term use. The unique ground electrode and the full-size center electrode also provides optimal performance for a guaranteed five years or 100,000 miles. Specifications Part Number: E3.56 Resistor: Resistor Hex Size: 5/8" Thread Reach: 0.750" Thread Diameter: 14mm Seat: Gasket Tip/Gap: DiamondFIRE Fixed Gap Cannot Be Adjusted