Usage Tips:Package includes: 3 different style of spark plug space gauge measuring tool can meet all your daily demands. Both of the wire spark plug space guage tools come with built-in space adjuster on both ends. So you can adjust the spark plug space after you're done with the measuring. The scale range of the coin-type spark plug space gauge tool is from 0.020in to 0.100in. The scale range of one of the wire-type spark plug space measuring tool includes: 0.025in, 0.030in, 0.034in, 0.035in, 0.040in, and 0.045in. The other wire-type one includes: 0.040in, 0.044in, 0.045in, 0.050in, 0.060in, 0.080in. All the spark plug gauge measuring tools are engraved in both imperial and metric units (front with imperial and back with metric). The spark plug space gauge measuring tools are made of alloy material, which is sturdy and durable. Both imperial and metric units are engraved precisely for easy and accurate reading. Colour: silver Material: metal Package Contents: 3 * Spark Plug Space Gauge Measuring Tool Only the above package content, other products are not included. Note: Light shooting 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.