Brisk GR15SXC Premium EVO spark plug for race car engines. Features a 14mm thread, 18mm (0.71in) reach, and 16mm (5/8in) hex with a tapered seat. Heat Range 15, resistor, with a multi-spark design for enhanced combustion efficiency in high-performance racing engines. Ideal for high-performance turbo setups. Recommended torque: 15-22 ft-lbs. Gap: 0.020-0.035 inches. Sold as each.