Klein Tools is an American company that produces hand tools. The company is headquartered in Lincolnshire, Illinois and was founded in 1857 by Mathias Klein. Klein Tools is known for its high-quality tools that are designed for professionals in the electrical, construction, and mining industries. The company's product line includes pliers, screwdrivers, wrenches, and other hand tools. Klein Tools has a reputation for innovation and has been awarded numerous patents for its products. The company is committed to sustainability and has implemented a number of initiatives to reduce its environmental impact.