-For use with copper-bonded ground rods -Parts that are UL Listed are suitable for direct burial in earth or concretePart Number HDC1 Article Number 158250 Torque (TQ) 16.9 to 50.8 N-m Material Silicon Bronze Ground Rod Diameter, Nominal 1" Ground Rod Diameter, Actual (Ø) 25.4 mm Conductor Size #8 Solid - 4/0 Stranded 10 mm² Solid - 95 mm² Stranded Wrench Size 9/16" Certifications cULus Qualifoudre Standard Packaging Quantity 50 pc UPC 78285630591 EAN-13 8711893129878