Great Compatibility: The engines spark plug gap tool is universal for various 12mm / 14mm threaded spark plugs. (Package includes 1 PC 12mm Spark Plug Gap Tool and 1 PC 14mm Spark Plug Gap Tool.) High Performance: Gives perfect gap to help you easily and properly replace the old or damaged spark plug for improving your vehicle performance and efficiency. No more banging the plug tip on random surface to close it and then use a coin gap to open it back up, saves your time and energy. Easy Operation: .