Compatibility: Spark plug gap tool is compatible with most of 10 mm 12 mm 14 mm 16 mm standard spark plugs. Please double check the size of your spark plugs before ordering
Tip for Adjustment: Some spark plugs electrode will spring back when adjust gap. It is recommended to use a smaller scale than the target gap, if your gap target is 0.38 mm, we suggest to use 0.36 mm, this way when it spring back you will get it to 0.38 mm
32-Blades Feeler Gauge: The feeler gauges are made of high-quality manganese steel, with measurement range from 0.0015 inches to 0.035 inches (0.04 mm to 0.88 mm). They are a 32-piece set that can provide you with perfect gap adjustment, allow you to adjust spark plug gap easily and quickly
Premium Materials: Spark plug gapper tool is made of high quality aluminum, sturdy and durable. We take strict quality control measures, select high-quality materials to ensure our product meet your expectation
Easy to Use: Simply place the spark plug onto the spark plug gapping tool and select your desired feeler gauge thickness, then screw the knob slowly till the side electrode compresses to the desired gap thickness