18-1.5mm Spark Plug Hole Kit. The item "Thread Repair Kit Spark Plug Size Series Metric 18-1.50mm Helicoil HEL552318" is in sale since Wednesday, May 16, 2018. This item is in the category "eBay Motors\Automotive Tools & Supplies\Hand Tools\Cutting Tools". The seller is "tooltopia" and is located in Shreveport, Louisiana. This item can be shipped to United States.