NGK Spark Plugs are high quality and have a unique design to guarantee the best possible performance. As the main source of power in any petrol engine, a spark plug performs an essential function: It is responsible for igniting the air-fuel mixture in the combustion chamber of petrol engines. This combustion process creates power, ultimately setting the vehicle in motion. Technical Data: Part Number: R5670-8, Trade No: R5670-8 Manufacturer: NGK Thread Length: 9.5mm Outer thread: 14mm Hex Nut Size: 20.8 mm Spark projection: 3mm Connector Type: Fixed SAE Spec: Nickle centre electrode Spec: Single earthed electrode Spec: no interference suppression Gasket Type Seat Quantity: 1 Unit