Features: 1.Universal Fitment: This spark plug gap tool is universal for 10mm 12mm 14mm 16mm spark plugs. Use your desired size feeler gauge for gap thickness. 2.Good Compatibility: Spark plug gap tool is compatible for NGK 6061, for NGK 5671A, for NGK BKR9EIX and similar spark plugs. 3.Professional: The spark plug gap tool will give you the perfect gap every time, just place the spark plug on the gap tool. 4.Maintenance: If the spark plug gap tool gets wet, dry it with compressed air and apply lubricant to prolong its life. 5.Bounced: If your clearance target is 0.44mm, we recommend 0.42mm, so you'll get 0.44mm when it bounces back. Specification: Item Type: Spark Plug Gap Tool Material: Metal Fitment: Universal for 10mm/0.39in, 12mm/0.47in, 14mm/0.55in, 16mm/0.63in Spark Plugs. Compatible for NGK 6061, for NGK 5671A, for NGK BKR9EIX and similar spark plugs. Not compatible with 18mm thread and longer style spark plugs.