The NC-Series is a line of ratcheting "CLICK" type torque tools. They resemble a standard 3/8" drive ratchet, however; upon reaching a specific torque value, they generate a distinct "CLICK" and have been designed in conjunction with major clamp manufacturers such as Clamp-All, M&G and U.S. Pipe & Foundry. The wrenches are PRESET at the factory to a value recommended by your clamp manufacturer.