The Senior Industries SI-2163 Meter Panel Clamp is engineered to provide an electrical ground connection to customer meter boxes without the need for a ground rod, ground rod clamp or long ground wire runs. The patented screw design (cone and tip arrangement) allows for intimate ground to base metal. There's no preparation of meter box surface required, and no need to loosen clamp to attach or remove ground wires. What's more UL and CUL listed.