The handle is tightened by the clamp bolt, so that the fixed tong body is fixed. The screws on the active pliers can rotate, but cannot move axial direction, and cooperate with the screw nuts installed in the fixed tong body. When the screw is relaxed, the activity pliers can be exit. The tiger tongs' activity tie cooperates with the guide rail of the fixed tong body through the guide rail. When the handle is shaken, the silk bar is spirked, driving the active pliers to move axially compared to the fixed clamp, clamp or relax the object under the action of the tip. Then on the body and active pliers of the fixed tiger tiger's pliers, each with a steel China industrial hooks-made steel fixed with screws and a cross -mesh tattoo, the effect of clamping and non -slip. Among them, the formula is written: the distance from the force point (the torque)*force = the force of the fulcrum to the power point distance (force arm)*force, this is a lever. The principle of leverage is also known as Lexe balancing conditions. To balance leverage, the size of the two forces (power points, fulcrum, and resistance points) on leverage is inversely proportional to their force arm. Both have both but the functional performance is different. The position of the gear is used for the use of different thickness parts, and it can also be used as a wrench. In the formula, F1 represents power, L1 represents the power arm, F2 represents resistance, and L2 represents the resistance arm. The fulcrum of leverage does not have to meet the following three points in the middle, which is basically leverage: fulcrum, force application point, and stress point. The powerful pliers we use are based on the principle of saving rods.