The Performance Tool spark plug gap setting tool is the perfect tool for quick and easy gap adjustments. With its decimal and metric markings, it's easy to read and set the gap accurately. The tapered hole allows for easy adjustment of the gap to the desired size. Made from high-quality zinc alloy, this tool is durable and long-lasting. This tool is capable of setting gaps in the range of .020 to .100 inches (.5 to 2.5 mm), making it suitable for a wide range of spark plugs. Don't struggle with inaccurate gap settings – make it easy with the Performance Tool spark plug gap setting tool.