1. Anodized Aluminum Alloy: The spark plug gap tool is made of a hardness aluminum alloy, which is durable, wear resistant, not easily damaged, and has a long service life. The handle surface is anodized for rust protection, ensuring the tool's strength and durability. 2. Universal Adjustment: The spark plug gap adjustment tool is compatible with most spark plugs with 0.394 inch, 0.472 inch, 0.551 inch, and 0.630 inch threads, but not with spark plugs featuring 0.709 inch or larger threads. Each tool undergoes strict testing before leaving the factory. 3. Precise Operation: With this spark plug gap tool, you can achieve the gap every time. This universal spark plug gap tool provides accuracy in adjusting the spark plug gap. Simply attach the spark plug to the hollow tool and slowly rotate the screw knob to adjust the gap. 4. How It Works: Insert the spark plug into the hollow tool, measure the gap value with a sensor, then turn the knob to slowly adjust the gap distance. The spark plug gap tool is lightweight, weighing approximately 220 grams, making it easy to carry and store.