Fits fourstroke gasoline chainsaws and gasoline generators that use F7TC spark plugs. Exterior Insulator Made from purity alumina ceramic, the exterior insulator provides electrical insulation to prevent leakage, supports good heat dissipation, and offers temperature impact resistance and corrosion resistance, enhancing safety during use. Melting Point Electrode Designed with a copper core and nickel alloy, the copper core aids heat removal for quick ignition, smooth operation, and reduced risk of overheating. This improves ignition efficiency, offers longer service life, and maintains stable combustion under extreme conditions or longterm use, delivering rugged durability and reliability. Easy Installation Easy to and maintain, this spark plug is designed for simple installation and removal, delivering a fit without tools. Use scenarios Regular maintenance replacement for fourstroke chainsaws and gasoline generators to ensure reliable ignition and stable performance. Suitable for yard equipment such as chainsaws, lawn mowers, cutoff saws, blowers, and brushcutters to maintain consistent starting and running. Reliable in extreme environments or during long operation sessions, providing durable ignition performance.