The NGK Spark Plug BPR5ES-11 Standard Plug #7634 is a high-quality product made in the USA, featuring copper material and a resistor plug for improved performance. This pack of 4 spark plugs is designed for direct replacement on gasoline engines, with a hex size of 13/16" (21mm) and a thread pitch of M14x1.25. It is a non-domestic product that meets the needs of car and truck owners looking for reliable ignition system components. The spark plugs are in stock and usually ship the same day, providing convenience and peace of mind for customers.