Designed for NGK 6061, NGK 5671A, NGK BKR9EIX and similar spark plugs, this spark plug gap tool gives you controlled, repeatable gaps for reliable ignition and peak performance. Key benefits Precise, repeatable gaps: aligns the electrode correctly so you get consistent gap results every time. Broad compatibility: works with 10 mm, 12 mm, 14 mm and 16 mm spark plugs — fits common sizes used in cars, motorcycles and small engines. Simple to use: place the spark plug on the gap tool and use your chosen feeler gauge to set the exact gap thickness. Professional guidance built in: if your target gap is 0.44 mm, set to 0.42 mm on the tool to allow for spring-back so the final gap measures 0.44 mm. Features and performance Function: accurately sets the spark plug electrode gap using the feeler gauge size you select. Compatibility: specifically suitable for NGK 6061, NGK 5671A, NGK BKR9EIX and comparable plug designs. Size support: universal for 10 mm, 12 mm, 14 mm and 16 mm spark plug diameters — you choose the feeler gauge for the gap thickness. Reliability: designed to give consistent results every time when used as instructed. Practical use scenarios Motorcycle tuning: quickly set the correct gap on a high-performance NGK BKR9EIX plug before installation. Routine vehicle maintenance: verify and correct gaps on NGK 6061 or NGK 5671A plugs during scheduled service. Small engine repair: check and adjust spark plugs on ATVs, scooters or lawn equipment that use 10–16 mm plug sizes. How to use 1. Select the feeler gauge that matches your desired gap thickness. 2. Place the spark plug on the gap tool so the electrode aligns with the gauge. 3. Bend the electrode until the feeler gauge fits with the correct tension. 4. For final gap compensation: if the service specification is 0.44 mm, set to 0.42 mm on the tool to allow for bounce-back. This tool makes gap setting faster and more consistent, helping ensure correct ignition performance for NGK 6061, NGK 5671A, NGK BKR9EIX and similar spark plugs.