Klein Tools is an American hand tool manufacturer founded in 1857 by Mathias Klein in Chicago, Illinois, making it one of the oldest continuously operating tool companies in the United States. Klein Tools has remained a family-owned company through six generations and is widely regarded as the gold standard for electrical and utility hand tools.
Klein product line includes pliers, screwdrivers, wire strippers and cutters, multimeters and test equipment, insulated tools, fish tapes, conduit benders, nut drivers, wrenches, knives, tool bags and pouches, hard hats, safety glasses, and high-visibility workwear. The brand is especially dominant in the electrical trade.