No of Plugs: 16, Gap Mm: 1.10mm Gap, Part Detail: SP1: 1 - Earthed Electrode, SAE Port, 3 kOhm->, ->:7.5 kOhm, Thread Size: M14x1.25, Thread L.:25mm, Spanner size: 16 mm, Copper-cored ground electrode, Copper-cored centre electrode, Package Qty.: 4, No of Plugs: 4, No of Plugs: 8