Spark Plug Tool Gapping Accessories Spark Plug Caliper Metal for NGK 5671A 14mm 16mm Spark Plugs Feature:1. Universal Tool: Applicable to 10mm 12mm 14mm 16mm Spark Plugs, as well as compatible with 6061, 5671A, BKR9EIX and similar spark plugs.2. Powerful Function: The spark plug tool could provide you with perfect every time, just place your spark plug onto the tool, easier and convenient to use.3. Match to Use: The heavy duty spark plug caliper can be used with your desired size feeler gauge (not included) to help you measure the spark plug thickness.4. Spring Back Phenomenon: It is pretty common for some spark plugs electrode to spring back, if your target is 0.44mm, we suggest to use 0.42mm, then you can get it to 0.44mm when it spring back.5. Recommendation: If the blue metal spark plug tool gets wet, you can use compressed air to dry and apply lubricant (not included), to get high performance again.Specification:Item Type: Spark Plug ToolMaterial: MetalApplication: Universal for 10mm 12mm 14mm 16mm Spark Plugs.Compatible with 6061, 5671A, BKR9EIX and similar spark plugs.Not compatible with 18mm thread and longer style spark plugs Package List:1 x Spark Plug Tool