Brisk MR14LC Silver Racing spark plug for race car engines. Features a 12mm thread, 26.1mm (1.03in) reach, and 16mm (5/8in) hex with a gasket seat. Heat Range 14, resistor, with a silver center electrode for superior heat transfer and ignition in high-performance racing engines. Ideal for turbo or nitrous setups. Recommended torque: 10-15 ft-lbs. Gap: 0.020-0.035 inches. Sold as each.