Brisk MR10S 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 10, resistor, with a silver center electrode for excellent heat dissipation and ignition in high-performance racing engines. Ideal for modified setups. Recommended torque: 10-15 ft-lbs. Gap: 0.020-0.035 inches. Sold as each.