Hi, Ryan You can get solid brass 1/4" x 3" standard threaded bolts at your local Home Depot store, assuming you reside in the U.S. Next to tungsten, bras is the best spark gap electrode metal that I have come across. You can also purchase solid brass 3/8"x 12" long theaded rods from the same, in case you decide to build a larger coil. Keep on Sparkin' David