Stanley Proto is an American industrial hand tool company and a division of Stanley Black & Decker. The company is credited with creating the first combination wrench. Proto tools are heat-forged and nickel-plated, making them tough enough to withstand even the most demanding work environment, from the blast of zero-degree temperatures to the rapid fire pace of the factory floor. They're the top hand tool brand for automotive and industrial workers. In addition, Proto hand tools are made in the USA to ensure the highest quality and most durability in the industry.