Extra HD DB Ground Clamp, 3/8" - 1" Rebar, 1/2" - 1" Water Pipe, 1/2" - 1" Copper Water Tubing, 1/2" - 1" Ground Rod, 8 STR - 4/0 STR Wire Range, cULus. For connecting wire to copper water pipe for grounding. Special pressure bar grips cable armor to lessen chances of grounding conductor being pulled out. Assembled with silicon bronze screws.