Function: 1. This do spot welding pen comes standard with a pair of Japanese concentric ball needles, which is effective. 2. Cordless spot welding machine 18650, suitable do long-term operation, improving work efficiency, made of thick brass rod. 3. The appearance is beautiful and clean and the heat dissipation is fast. Suitable do mounting battery packs. All brass rods are cleaned and protected with strong acid to ensure the brightness of the brass rods. 4. The handle of this pen do spot welding ma double springs do expansion and contraction, both of which can be independently expanded and contracted with moderate force control. 5. This spot welding machine pen is suitable do industrial spot welding, convenient, durable and strong. Specification: Item Type: do spot welding pen Material: brass ABS Applications: Suitable do industrial spot welding Operating voltage: DC 4-12 V Current: 800A The product is an external welding pen do high power spot welding machine (excluding spot welding machine) List of packages: 1 x do spot welding 2 x Coaxial Ball Needle 2x Spring 1 x Hex Wrench How to use: 2 clamps are connected do positive and negative poles of the output end of the spot welding machine and a spot welding operation can be performed.