Amazon.com: 500 Amp Welding Ground Clamp, Copper Welding Earth Clip, Terminal Lug Connector for Manual Welder for Welding Machine, it is Used to Connect The Welding Machine with The Ground Wire :
MUTUACTOR 500 AMP Magnetic Welding Ground Clamp, Strong Gripping Quick Release Magnetic Mount Welding Support Clamp Tools for Welding Cutting Factories Industries Work Shop and Instrument Processing - Amazon.com