Efficient Adjustment: Fine-tune spark plug gaps with precision to meet diverse model requirements, delivering smooth engine operation and improved performance. Effortless Operation: Insert the feeler gauge to measure and adjust the electrode gap quickly and accurately, enabling maximum engine efficiency with minimal effort. Built to Last: Constructed from high quality materials with precision machining for long lasting, wear resistant performance suitable for frequent use. Wide Compatibility: Supports 10, 12, 14, and 16 mm spark plugs, making it versatile for both cars and motorcycles. Reliable across varied specifications for daily upkeep and advanced modifications. Use scenarios - Routine maintenance on a car or motorcycle to ensure spark plug gaps match spec for smooth idle and reliable starting. - Performance tuning or troubleshooting to dial in exact gaps for improved throttle response and combustion stability. - Garage or workshop setting with engines using different plug sizes, enabling quick switching among 10/12/14/16 mm plugs.