... S59,S75,S95 drilling rod and all kinds of casing rod. It can be equiped with hydraulic drilling ... hydraulic clamp consists of main clamp and back-up tong, light and high efficiency.2. Main clamp and ... valve on the main clamp, the back-up tong can clamp or loosen the tubular pile, flexible ... connect effectively5. The arrester is on the top of tong head, which makes the service very convenience.6. ...