Description Neilsen Universal Spark Plug Gap Adjustment Tool Kit Set 10mm - 16mm Universal Spark Plug Gap Tool Fit for all 10mm 12mm 14mm 16mm threaded spark plugs. The spark plug caliper tool perfectly solves the problem that the vehicle cannot be started due to the spark plug gap distance is too large to generate effective arc for ignition work. Easily rotate the screw to change the gap of spark plug, prevent spark Plug wire marks or nicks, so as to enhance the spark plug and engine performance Need to put the spark plug in one end, screw spark plug into the bottom of gap tool; use the feeler gauge in place, turn the knob until the side electrode is compressed to the desired gap thickness. ( Feeler Gauge Not Included)
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