Check the listing for details. Buck Performance Precision Spark Plug Gap Tool 12mm - Gapper Gapped Gapping. Condition: New. Listed at 69.95 USD. NEW all in One Spark Plug Gapping Tool with Gauges Spark plug gapping tool is designed to save time and precision. Many Engine Builders and Tuners will tell you how critical it is to properly and accurately gap a plug. With this tool you will be able to gap plugs faster and maintain accuracy. No more Banging your plugs on hard objects to close the gap and hope that you didn't crack the porcelain. Unlike other tools out there when you tighten down on the ground strap this has a stainless steel ball bearing to spin with the thumb screw to no twist the strap. Three sizes to choose from this auction is for 12mm message me for other sizes and or check out our other listings Included Ignition Feeler Gauge sizes: .010,.012,.013,.015,.016,.017,.018,.019,.020,.022,.024,.025,.026,.028,.030,.032,.035 We recommend having 9 gauges or less in the tool at a time. The common stack is: 1).012 Both .012,.022 Stacked = .034 2).022 Both .022, .018 Stacked = .040 3).018 Both .018,.020 Stacked = .038 4).020 Both .020,.024 Stacked = .044 5).024 6).026 7).028 8).032 You tube Video of How it works. https://youtu.be/CFAGDv_5oZw Please confirm thread size for your plugs before purchase Let us know in the comments what size you need. Check out or site: Buckperformance dot com.