1. Wide applicability Through precise craftsmanship, the threaded rod is extended to a deeper length, making this new version of the spark plug gap gauge suitable for 99% of spark plugs on the market and increasing universality. 2. Universal spark plug gap tool This gap tool with a feeler gauge is designed for spark plugs with 10 mm, 12 mm, 14 mm, and 16 mm sizes, specifically for short threaded spark plugs used in small engines such as chainsaws, trimmers, and other equipment. 3. Precise measurement Some spark plugs may experience electrode gap rebound, so we recommend using a measurement value that is 0.002-0.004 inches less than the target value. For example, if you want a 0.016 inch gap, we suggest using a measurement of 0.012-0.014 inches, so that when it rebounds you will achieve a 0.016 inch gap. Simple and efficient. 4. Easy to use Simply place the spark plug into the universal spark plug gap tool, insert the feeler gauge with the desired gap thickness, rotate the knob until the electrode is compressed to the desired gap thickness. Very easy to use.