Proto® Industrial Tools is a part of the Stanley Black and Decker, Inc. brand, and one of the most trusted names in ratchets, sockets, wrenches, and other hand tools. For more than a century, Proto® has provided leading American-made SAE and metric combination socket options that feature their patented TorquePlus™ internal designs, giving users up to 15% more torque and improved precision grips. Combination sets come in blow molded cases for easy-to-organize and durable storage options.