This boxed spark plug from Champion Indust. / Agri Plugs is the perfect choice for your ignition system. With a reach of 0.75 IN and a thread diameter of 22.2 MM, it is compatible with a variety of vehicles. The plug type is W18 and the manufacturer part number is 518. The Champion Agricultural Plugs are made with a nickel copper alloy for both the center electrode tip and the ground electrode core. The plug is designed for easy installation and has a hex size of 23.8 MM. The manufacturer heat range is 18 and it is made in Mexico. This spark plug is a must-have for any car or truck owner looking to improve their ignition system.