The characteristics include:
1. In the negative camber roller climb clamping structure, either of the two jaws is two die holders, and pipe body is forced in four directions, so that different pipe diameters can be accommodated by changing tong dies, and the pipe body can be clamped by the four dies in 340°;
2. A gate-control unloading mechanism is provided, so as to significantly improve the safety of use and maintenance;
3. The reaction force point is set in the tail end of the master tong, which eliminates the effects to the torque caused by space between the master tong and back-up tong. This power tong is suitable for the make-up and break-out of tubing threads.