NGK BPR6EF Spark Plugs are designed to provide reliable ignition for your vehicle. These nickel spark plugs feature a 14mm external thread and require a 16mm spanner size for installation. The spark plug has an earthed electrode with 5 kOhm interference suppression and a nickel middle electrode. It also includes an unscrewable SAE connector and a taper gasket seat, with a spark position of 3mm and a thread length of 17.5mm. Quantity included: 4.