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 tptation or backward rotation and the hole raming 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.
