Brisk AR08S Silver Racing spark plug for race car engines. Features a 10mm thread, 19mm (3/4in) reach, and 16mm (5/8in) hex with a gasket seat. Heat Range 8, resistor, with a silver center electrode for superior heat transfer and ignition in high-performance racing engines. Ideal for naturally aspirated or modified setups. Recommended torque: 7-10 ft-lbs. Gap: 0.020-0.035 inches. Sold as each.