1. Material Durability Made from hardness aluminum alloy with an anodized surface treatment, this spark plug gap tool offers exceptional corrosion and rust resistance, ensuring longlasting durability and strength. The robust construction guarantees reliable performance, making it a musthave for both automotive enthusiasts and professionals alike. 2. Universal Compatibility Suitable for most spark plugs with gaps of 0.394 inches, 0.472 inches, 0.551 inches, and 0.630 inches, this versatile tool is ideal for a wide range of vehicles. It is not compatible with spark plugs featuring 0.709inch or larger thread gaps, making it adaptable for various automotive maintenance needs. 3. Precise Adjustment Achieve pinpoint accuracy with this spark plug gap tool, allowing for meticulous adjustment of spark plug gaps. Simply attach the spark plug to the hollow tool and gently turn the screw knob to finetune the gap, ensuring engine performance and fuel efficiency. 4. Easy to Use The intuitive operation involves inserting the spark plug into the hollow tool, measuring the gap value with a sensor, and then adjusting the gap by turning the knob. This userfriendly design ensures hassle adjustments, making it a practical addition to any toolbox.