We supply casing tongs which are used for making up and breaking out pipes or casings of 4 13-3/8. The tong heads are designed to be open type and can freely clamp and escape from the pipes for casings. These casing tongs are safe, reliable and easy to handle with high mobility, they can be connected to computer controlling units and can serve as ideal well mechanical tool for surface operations in oilfields. These tongs are designed, manufactured and inspected according to API Spec 7K. Torque monitoring systems can be matched to these tongs to record and save the ultimate data such as torque, number of circles, torque/number of circle, torque/time, curves, date, time, well-team number, single and total length. They can automatically control the making-up torque and the circles number to ensure connected joint in the best condition.