Wide Application - Designed for all 12mm 14mm threaded spark plugs. Package includes 1 x 12mm spark plug gap tool (blue), 1 x 14mm spark plug gap tool (black), and 1 x 32 Blade Steel Feeler Gauge. Not for short reach type spark plugs, please mind the size before purchasing

Perfect Performance - With the spark plug gap tool and feeler gauge, you can more precisely to adjust the spark plug gap and properly replace the old or damaged spark plug to improve vehicles' performance and efficiency

Simple Operation - Easy to adjust only by screwing the knob rather than using the hammer, the spark plug gapping tool assures you precise gap adjustment and greatly reduces electrode damage. No more spark plug wire marks or nicks so as to optimal spark plug and engine performance

Feeler Gauge - Easy Identificationdual marked metric and imperial, 0.001inch to 0.04inch (0.03mm to 1mm), the numbers of size are etched into feeler gauge for easy identification

Adjustment Tips - Some spark plug electrodes will spring back when adjust the gap. Using a feeler gauge 0.001-inch smaller than the target gap is recommended when using this gap spark plug tool