NGK CMR6H Spark Plugs. This standard nickel electrode spark plug is designed for ignition service and engine starting. It features a copper core and a nickel middle electrode with one earthed electrode. The spark plug has a thread size of M10 x 1.0, a spanner size of 16 mm, and a thread length of 12.7 mm. The spark position is 1.0 mm. It includes interference suppression of 10 kOhm and a gasket seat, with a fixed SAE connector. NGK is a leading brand in the spark plug market, known for its quality and technical excellence. This product is compatible with HONDA OEM references 31916Z0H003 and 31916ZOH003. Cross-references include BOSCH 0 242 035 500, 0 242 050 510, 02420356500, USR4AC, and USR7AC.