It's a 33 mm Tassello di spinta from KS TOOLS, a specialized driving tool used to provide a precise and controlled spark to ignite fuel in engines. It's a must-have for mechanics and DIYers, as it ensures a perfect, clean spark every time, which is crucial for optimal engine performance and to prevent costly repairs. With its robust construction and durable material, this tool is built to withstand heavy use and last a long time, making it a valuable investment for anyone working with engines.