[General accessories] 10mm 12mm 14mm 16mm plug is universal. Measure the gap thickness with a feeler gauge of the required size. (However, it is not compatible with 18 mm thread and type plugs.)[Notes on springback] Some plug electrodes will spring back - this is normal for some plugs. If your gap is 0.44mm, we suggest using 0.42mm. When it rebounds, you will get 0.44mm.[ work] This plug clearance tool can you with perfect clearance time. Just place the plug on the clearance tool perfectly, so the clearance can be easily and accurately carried out. Good tool[Installation] 1. Just put the plug into the clearance tool. 2. a feeler gauge of the required size to measure the gap thickness. 3. Turn the knob to put the feeler gauge in place until the side electrode is compressed to the required gap thickness.color: redmaterial: metalPackage Contents:1 x plug gap tool1 x Feeler GaugeOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.