Drill Pipe Rotary Clamp Device is installed on the wellhead, when the kelly is not on the wellhead (inside the rotary table), it may give drill pipe a forward torque or backward torque, and to finish forward rotation or backward rotation and the hole reaming operation instead of the kelly. The merits of it are: it can be directly installed on the wellhead or casing on the drill tools without unleashing the drill tools. It can accommodate drill pipe from 2 3/8 inch to 5 inch, the rated torque of it is 60KN.m