●Uniquely designed with a tapered conical pit on the bottom of the driver throat makes contact with the top of the ground rod. It minimizes the mushrooming of the rod during high pressure hammering. ●0.78’’ pit,7.75 sq inch stress area,4.5 pounds weight highly strengthened industrial steel ground rod driver cap, great for for 1/2" , 5/8" and 3/4" ground rods. ●Galvanized finish for maximum rust resistance for long-lasting and recyclable use. ●MOKIKUBA products are ergonomically designed and individually inspected to make sure it meets our high standard.