Drill Stem Rotary Tool is a kind of well bead tools, it can be replaced kelly stem to pass rotating torque to the drill pipe for finishing clockwise rotation or back reaming operation.It is a necessary tool in freepoint and backoff operation.

 

Type	Exterior size(mm)	Suitable drill pipe size(mm)	Max torque(KN·m)	Length of stroke(mm)
ZX2	320×320	88.9   114.3   127	60	1000