OZ-Gedney Type G Universal Ground Clamp, Length: 14-13/16 IN, Size: 12 IN, Malleable Iron, Bolts And Nuts: Steel, Finish: Hot Dip Galvanized, Bolts And Nuts: Hot Dip Or Mechanically Galvanized, 16 IN Height, 7/8 IN Thick, Ground Pipe Size OD: 12 - 13.5 IN, 5/16 IN U-Bolt, Third Party Certification: UL File Number E-24264, CSA 009795, Applicable Third Party Standards: UL 467, CSA C22.2 No.18, Federal Specification W-F-406E, For Connecting Grounding Conductors To Cold Water Ground Pipe