1. ground rod connectors. 2. we have our own molding system to make high quality ground rod accessories. For connecting ground conductor to zinc or copper ground rods. Cast from high strength, highly conductive copper alloy. Assembled with Zinc plated steel screws.Cat. No. Size Standard PackGRD-J12 1 / 2 " 100 GRD-J58 5 / 8 " 100 GRD-J34 3 / 4 " 100 GRD-J88 1 " 100 ground systerm