Range Taking Ground Rod Clamp for 3/8-3/4in. Rod This heavy duty ground rod clamp replaces all existing ground rod clamps, eliminating the need to stock several different sizes and types. UL Listed for direct burial in earth and concrete, heavy duty construction enables it to handle large ground wires up to 1/0 AWG- much larger than a standard ground rod clamp. Suitable for 3/8", 1/2", 5/8", 3/4" ground rods.