OZ-Gedney Type GH Swivel Ground Hub, Conductor Size: 8 - 4 AWG, Length: 1 IN, Size: 1/2 IN, Cast Bronze, Screws: Brass, 1-3/8 IN Height, Dimension B: 1-1/2 IN, Dimension D: 3/8 IN, Third Party Certification: UL File Number E24264, Applicable Third Party Standards: UL 467, Federal Specification W-F-406E, For Use With Universal Ground Clamps To Connect Grounding Conductors Run Bare, In Armor Or In Conduit