Product Description: Versatile Spark Plug Gap Tool for Accurate Engine Tuning Achieve perfect spark plug gaps effortlessly with our versatile Spark Plug Gap Tool. Designed for precision and ease of use, this tool ensures optimal engine performance by providing precise gap adjustments. Discover the features that make this tool a must-have for any automotive enthusiast: Universal Tool: Our spark plug gap tool is compatible with a wide range of spark plugs, including 10mm, 12mm, 14mm, and 16mm sizes. It is ideal for use with NGK 6061, NGK 5671A, NGK BKR9EIX, and similar models, making it a versatile addition to your auto accessories collection. Powerful Function: Achieve the perfect spark plug gap every time with ease. Simply place your spark plug onto the gap tool, and its intuitive design will guide you to the ideal gap measurement. This user-friendly tool simplifies the gapping process, ensuring your engine runs efficiently. Match to Use: Enhance your precision with a heavy-duty spark plug caliper that can be paired with your desired size feeler gauge (not included). This combination allows you to accurately measure the spark plug gap thickness, ensuring consistent engine performance. Spring Back Phenomenon: To account for the common spring back of spark plug electrodes, we recommend setting your initial gap slightly smaller. For example, if your target gap is 0.44mm, set it to 0.42mm initially to achieve the perfect 0.44mm gap after spring back. Recommendation: Maintain high performance and longevity of your blue metal spark plug gap tool by keeping it dry. If it gets wet, simply use compressed air to dry it off and apply a lubricant (not included) to restore its functionality and ensure it continues to deliver precise results. Optimize your engine's performance with this essential Spark Plug Gap Tool, designed for accuracy and ease of use. Its universal compatibility, powerful functionality, and durable construction make it an invaluable tool for anyone looking to fine-tune their vehicle's spark plugs. Experience the benefits of precise gapping and improved engine efficiency today.