Welding ground clamps attach to the workpiece to allow current to create the arc required for welding. Sometimes called earth clamps, they also reduce the risk of shock.
C-Style Ground Clamps
C-style ground clamps have wide jaws for clamping thick materials. They tighten to the workpiece using the integrated hand screw, which allows the clamp tension to be manually adjusted for work where a standard clamp might be dislodged.
C-Style Ground Clamps, sorted by Current (Maximum), ascending