Tweco 9255-1060 Switchable Magnetic Ground Welding Clamp, 200-Amp 200-Amp capacity Can be used as a ground clamp device around pipe and flat applications, or with any large magnetic base metal Used to lay the ground clamp magnetically attached to the metal being welded for electrical ground Switchable -- easily be removed by turning off the magnetic function to release the ground clamp Long lasting, rugged and reliable design