Features and Benefits:•1 inch hole and 15-1/2 inch overall length•1-1/8 inch Collared Hex Shank with Notch•Ground Rod Driver•Made from forged high grade steelDrives soft ground rods. Socket depth - 3 in., inner diameter - .906. rod diameter 5/8 in. and 3/4 in., length 15-1/2 in.