The E3.82 E3 Premium Spark Plugs are a high-quality choice for both import and domestic applications. This 6-pack of spark plugs features a copper core material and ceramic top material, ensuring reliable performance and durability. The thread size is 12mm x 1.000, and the hex size is 5/8, making it compatible with a wide range of vehicles, including cars, trucks, vans, motorcycles, and more. The thread reach is 1.000, and the seat is gasket. These spark plugs come with a fixed gap that cannot be adjusted, specifically a DiamondFIRE fixed gap. The product is branded as E3 Sparkplugs and is an authentic and reliable choice for your vehicle's spark plug needs.