Portable impact wrench, for removing and installing the sleeper bolts, especially suitable for the tunnel and closed operation environment；

Accurate and constant output torque，It is the essential machine to high speed and new-built railways，150N.m, 200N.m, 250N.m, 350N.m, LCD screen display, easy to set up；

Meet the required torque will automatically stop the impact；

Every tightening of a bolt about 6 to 8 seconds；

Each cell in the 150N.m block, the continuous operation of about 1.5 hours, about 700 nuts, railway line length (one side) about 350m.