This series power tong is used for quick make-up/break-out 2 7/8", 3 1/2"，4 1/2" tubing,4 1/2"、5 1/2" Casing,2 3/8",2 7/8", 3 1/2" drill pipe in well service operations. The tongs have the following feature:
1) Clamp the tubing use corresponding dies, die seat and dies can be custom-made.
2) Torque control valve may be equipped (optional).
3) Choose and buy lengthening guide pole assembly, the backup tong can clamp the tubing body.
4) Torque Control System may be equipped (optional)
Remark: 
The backup tong of Model XQ140/12B: using planet claw, needn't to change any parts for 2 7/8", 3 1/2"，4 1/2" tubing.
The master backup tong of Model XQ140/20XA: needn't to change any parts for 2 7/8", 3 1/2"，4 1/2" tubing.