... backup clamp casing & tubing Structure and featuresThis hydraulic clamps machine adoptshyperboloid roller-climbing clamping mode.Two slope plates ... structure and isinsisted of driving clamp, backup clamp, machine body, torque testing device, hydraulicpower supply, electric control ... one jaw plate ,one teeth (see table) , one manual instruction, one pressure - torque table. model specificationYNJX-230/ ...