assurance test, faster response, cheaper and easier to install. No more knocking the plug head on a random to close it, and then using a coin to open it back. Do it accurately once with our tool. Foldable feeler gauge for easy carrying and storage. 32 pieces of thickness feeler gauge, easy to measure width. , Never Used or Installed. Application: Spark Plug Tool: Suitable for most 10mm 12mm 14mm 16mm spark plugs. Feeler Gauge: Measuring range is 0.0015 inch (0.04mm) - 0.035 inch (0.88mm). Vehicle compatibility chart is for reference only. Check product type and size to meet your needs. Colour:As Shown Material:Aluminum Alloy Package Contents: 1 * spark plug 1 * 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.