Brisk NAOR12LGS Premium Racing spark plug for race car engines. Features a 10mm thread, 12.7mm (1/2in) reach, and 16mm (5/8in) hex with a gasket seat. Heat Range 12, resistor, with a surface discharge design for improved spark and combustion in high-performance racing engines. Ideal for high-compression setups. Recommended torque: 7-10 ft-lbs. Gap: 0.020-0.035 inches. Sold as each.