The Senior Industries Meter Corner 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 features a cone and tip arrangement for intimate ground to base metal. No preparation of meter box surface required, and no need to loosen clamp to attach or remove ground wires! What's more, it;s UL and CUL listed.