This NVENT ERICO CP58 Ground Rod Clamp is designed for use with 5/8" rods, #8 solid and #2 stranded, and is sold in a set of 5. The clamp is made by ERICO, a well-known brand in the electrical equipment industry, and is manufactured in the United States. It is ideal for use in connecting wires to ground rods and is compatible with a variety of electrical equipment and supplies.