1.External touch body with comfortable handle, good insulation property, high impact strength and heat-resistant strength. 2. Internal electric conductor is adopted the plated copper with nice electrical conductivity, low resistance or less heat. 3. Adopt top-grade spring steel with high elastic strength to ensure the welding rod in stable gripping and hard to fall off. 4. The insulated spring sheath guarantees the outstanding insulation. 5. Various types are available