1[High Efficiency] Spot welding pen uses thick copper platoon, which is beneficial to improve work efficiency and is suitable for long term use. 2[Good Heat Dissipation] Integrated design, exquisite workmanship, beautiful and clean, and good heat dissipation effect, to meet your various need. 3[With Double Springs] There are double springs on the handle, and each soldering pen can be expanded and contracted independently. 4[Labor Saving] This spot welding pen is feel comfortable, which is durable, stable and reliable, wear resistant and labor saving, so you can use it with confidence. 5[Simple To Use] Integrated limit switch, and can be one handed operation, no pedal required, suitable for 18650 battery spot welding machine.