1、Universal Compatibility: This spark plug gapping adjustment tool is designed to accommodate most standard spark plugs, including sizes 10mm, 12mm, 14mm, and 16mm. It is an indispensable tool for a wide variety of vehicles and applications, although it does not support 18mm thread plugs. 2、Rugged Aluminum Construction: Made from excellent aluminum with a matte finish, this universal spark plug gap tool combines durability with a lightweight design. The robust material ensures longevity and reliability, allowing you to make accurate spark plug gap adjustments over time without the risk of damage. 3、Effortless Gap Adjustment: The spark plug gapping tool is engineered for easy and quick manipulation. Simply place the spark plug onto the gapper, select the appropriate feeler gauge, and gently screw the knob to set your desired gap thickness. This intuitive design streamlines the gap adjustment process, making it accessible for both beginners and experienced mechanics. 4、Accurate Measurement Technique: Some spark plug electrodes may spring back after adjustment. To achieve accurate gaps, it's recommended to slightly under adjust. For example, if your target gap is 0.44mm, set it to 0.42mm initially to compensate for any springback, ensuring optimal performance when installed. 5、Versatile Applications: This universal spark plug gapper is a must have for both handcraft enthusiasts and professional mechanics. It is versatile enough to be used across various types of vehicles, including cars, motorcycles, and lawn equipment, making it an essential addition to any automotive toolkit. Item Type: Spark Plug Gap Tool Material: Aluminum Fitment: Replacement for Most Approx. 10mm / 0.39in, 12mm / 0.47in, 14mm / 0.55in, 16mm / 0.63in Spark Plugs 1 x Spark Plug Gap Tool 1 x Adjustment Screw 1 x Steel Plug Gauge