- Premium material and durability This spark plug gap tool is crafted from a high hardness aluminum alloy with an anodized finish. It delivers excellent corrosion and rust resistance for long lasting strength and reliable performance. The robust construction makes it a dependable tool for automotive enthusiasts and professionals alike. - Universal compatibility Works with most spark plugs that have gap sizes of 0.394 in, 0.472 in, 0.551 in, and 0.630 in. This universal tool is suitable for a wide range of vehicles. Note that it is not compatible with spark plugs that have 0.709 in or larger thread gaps, which vary by maintenance requirements. - Precise adjustment Achieve accurate gap settings with this tool to carefully tune spark plug gaps. Attach the spark plug to the hollow tool and gently turn the knob to fine tune the gap for optimal engine performance and fuel efficiency. - Easy to use The operation is intuitive: insert the spark plug into the hollow tool, which measures the gap with a sensor, and then set the distance by turning the knob. This user friendly design ensures smooth adjustments, even for beginners, making it a practical addition to any toolbox. - Practical use scenarios - Home garage maintenance for daily drivers to ensure correct ignition gaps and reliable starts - Professional repair shops performing routine ignition system checks across multiple vehicle types - Fleet maintenance to expedite gap checks and maintain consistent engine performance across a fleet