Features: 1. Durable material: The welding head is made of copper, iron and insulating plate. Durable and sturdy, the copper tail welding magnetic head has good welding stability. 2. Strong magnetism: Welding heads are easily attached to any smooth metal surface, whether flat or curved. It grips tightly and doesn't deform easily, so there's no need to spend minutes searching for a good ground or attaching a ground lug. 3. Ease of use: Soldering jobs no longer have to waste time finding, placing or removing ground points. Solder the head as a ground point and you can do it anywhere. Just pin it in a convenient place, hang your safety wire, and you're ready to solder. 4. Provide convenience: Sometimes you are faced with a limited choice of welding work docking sites. You don't want to damage your car's paint just to stick a safety wire. This magnetic clip is useful in this situation. You can stick to the body without damaging the paint. 5. We offer 2 options for you to choose. One is single head and the other is double head. Please choose the right one before buying