Product Description NGK's 'copper core' technology creates spark plugs that provide an ultra wide heat range to ensure easy starting and smooth running in either low or high RPM conditions. To make sure the combustion process runs smoothly, the spark delivered by the spark plug must ignite just before the piston reaches its highest point and the compression is at its greatest. When using NGK spark plugs, the quality of this ignition improves the driving operation by ensuring smooth running as well as enhancing performance and efficiency of the engine. By selecting NGK spark plugs for your engine, you are selecting spark plugs which are the No.1 choice of the professionals. System Requirements Outer Thread [mm]: 14.0Spanner Size: 20.8 mmSpark Plug: Unscrewable SAE connector; with gasket seat; no interference suppression; Nickel Middle Electrode; 1 - Earthed ElectrodeSpark Position [mm]: 3Thread Length [mm]: 19 Legal Disclaimer NGK BP5ES Spark Plug Box Contains 1 x NGK BP5ES Spark Plug See more