Features A pair of Japanese concentric ball head pins are provided as standard, and the use effect is good. 18650 battery spot welding pen, suitable for long‑term work, improve work efficiency. Made of thick brass strips, beautiful and clean appearance, the overall brass strips, heat dissipation quickly. Very suitable for use in assembling battery packs, all brass bars are cleaned and protected by strong acid to ensure the brightness of the brass bars. The handle is retractable with double springs, each soldering pen is independently retractable, and the strength is moderately controlled. Specification: Item Type: Spot Welding Pen Material: ABS, brass Uses: Suitable for industrial spot welding Working Voltage: DC4-12V Current: ≥800A Package List: 1 x Spot Welding Pen2 x Concentric Ball Pin2 x Spring1 x Hex Wrench Note: This does not require a power supply, just connect the positive and negative poles of the output end of the spot welding pen to this welding pen and you can use it.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.This product is only a spot welding pen, without spot welding machine. Package List 1 x Spot Welding Pen 2 x Concentric Ball Pin 2 x Spring 1 x Hex Wrench