Material: This portable spot welder is made of circuit board, which is wear-resistant and durable, so it can be reused. Adjustable: This DIY kit welding machine has 99 gears power which can be adjusted according to your welding needs. Wide Application: This 99 Gears Welding Machine can be used to weld iron plates and most kinds of lithium batteries. Easy to Use: The lithium spot welding equipment is small in size and comes with a pen, making it convenient to use. Matching Occasion: The repair soldering tool can be used in many cases, such as home circuit panel repair and outside of professional welding work. Specification: Material: PCB. Size: Approx. 80x45mm / 1.77 inch. Voltage: 12V. There may be a few color distortions due to different computer resolutions. There may be a slight error due to different hand dimensions. The package contains: Type 1: One-piece control board. 2 pieces of input cables. 2 pieces of output wires with 6 square point soldering irons. 1 set screw with heat shrink tube. 1 piece 1m sheet. Type 2: 1 piece control board. 2 pieces of input cables. 2 pieces of output cables with 6 square soldering irons. 1 set screw with heat shrink tube. 1 piece 1m sheet. 1 piece cover. 1 piece 3 Screwdriver in 1.