One of the most common injuries in industrial bolting is finger pinching with the reaction arm or the backup wrench. HYTORC Backup Wrenches reduce the risk of injury by providing a convenient hands-free solution to stop the counter-nut from turning. Magnetic locks allow the magnetic backup wrench to be quickly installed and held in place against the side of a steel application. With hydraulic backup wrenches the tension is released hydraulically, which means no hammer or open-end spanner is needed.