The 405 SPARK PLUGS set of 4 by Autolite is a high-quality product manufactured in the United States. These spark plugs are designed for gasoline-powered vehicles, with a thread diameter of 14 mm. Autolite is a well-known brand in the automotive industry, offering reliable and durable ignition components. With this set of spark plugs, car and truck owners can expect optimal performance and efficiency for their vehicles.