... precise bolting process ,it only requires power supply of 220-230V, 50/60Hz2.Efficient.. Continuous rotation ... double speed can be shifted easily.5.Two ways of torque setting:- Set the torque manully- System recommends ... motor-speed control system makes the life span of carbon brush 10-20 times longer than ... ,1 set operating instructions,1 piece of test report , ABS plastic case. Digital Electric Torque ...