[Universal Fitment]Universal for 10mm 12mm 14mm 16mm spark plugs.Used your desired size feeler gauge for Space thickness.(BUT NOT compatible with 18mm thread and longer style spark plugs.) [Spring Back Note]Some spark plugs electrode will spring back - this is normal for some spark plugs.If your Space target is 0.44mm we suggest to use 0.42mm this way when it spring back you will to 0.44mm. [Precision Work] This Spark Plug Space Tool will give you that perfect Space every time.Simply place your spark plug onto the Space tool perfectly, this made it sooo easy to Space precisely,Great tool [Installation]1. Simply place your spark plug into the Space tool.2. Use your desired size feeler gauge for Space thickness.3. Turn the knob with the feeler gauge in place till the side electrode compresses to the desired Space thickness. Colour:black Material:Metal Package Contents: 1 x spark plug Space tool 1 x Feeler Gauge Only the above package content, other products are not included. Note: Light 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.