C-Clamp Ground/Work Clamp The Heavy Duty 600 Amp C-Clamp Ground/Work Clamp is the ultimate tool for a welder that wants to quickly set-up, weld, and move to the next job. Reduce Welding Downtime - Clamp can be attached or moved quickly from one fixture to another without having to remove the ground device. Efficiency - Features an ample contact area along with a large tightening screw to increase productivity. . Versatility - Constructed from copper alloy to allow for use in multiple ground applications.