For materials with different line diameters, the force applied by the tools during bending and cutting is different, which puts different strength and toughness requirements for the materials of the tool. For materials with larger diameter and high hardness of processing of 4.0 or 4.0mm, such as oil quenching steel, this requires higher the toughness and strength of the tools of the tool. At the same time, it is necessary to consider the angle of the tip of the knife, the smooth transition of the blade and the blade.As far as the safety of spring and the service life of the tools, the use of welding tungsten steel can solve this problem well. If it is easy to crack tungsten steel, it is not safe to splash on the workers. For line diameters below 1.0, lines and wire wheels can be used tungsten steel.