[General accessories] 10mm 12mm 14mm 16mm spark 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 spark plugs.) [Notes on springback] spark plug electrodes will spring back - this is normal for spark plugs. If your gap is 0.44mm, we suggest using 0.42mm. When it rebounds, you will 0.44mm. [Precision work] This spark plug tool can you with perfect time. Just place the spark plug on the tool perfectly, so that the can be and accurately carried out. Good tool [Installation] 1. Just put the spark plug into the tool. 2. Use 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: red material: metal Package Contents: 1 x spark plug gap tool 1 x Feeler Gauge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.