651 copper Hardware

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These are 651 Silicon Bronze bolts are a copper alloy that is 98% copper. 5X MORE CONDUCTIVE THAN STAINLESS STEEL, 4X MORE CONDUCTIVE THAN STEEL! 2" is good for single ply box and 3" is good for double ply box. 4” available too. Each order of one bolt comes with two nuts and two washers. Thread is 1/4-20 Show more