The design of the Atlas Copco Tensor ETP-STR61 nutrunner was based on the demands of robustness, premium values, good ergonomics (i.e. weight reduction and heat transportation) and to add features new to the market in the most demanding environments. The surfaces of the tool should be very fit and slim covering engine and gearbox. The space in the tool’s handle is designed to communicate both strength and protection for the operator’s hand. The ETP-STR61's daily use is in car assembly lines, airplanes and other products where it is important to have very high torque accuracy and the demands for efficiency are increasing.