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The Bosch 9603 Double Iridium Spark Plugs are designed for a wide range of vehicles including Acura, Lexus, Toyota, and Subaru. This pack of 4 spark plugs features a 14 mm thread diameter, standard configuration, and a voltage of 12 V. Made with double iridium material, these spark plugs offer reliable performance and long-lasting durability. With a hex size of 5/8 inches, these spark plugs are easy to install and ideal for gasoline-powered vehicles.