This is a Bedini SSG solderless circuit board for easy exchange of components. The bolts are 6-32 pan head machine. You can use 3/8" or 1/2" long bolts. In the picture you can see that I have two of the circuits paralleled.
You can learn about this technology here: http://www.energyscienceforum.com/forumdisplay.php?f=48
Disclaimer. Experiment with this Thing at your own risk.
If you would like a kit that includes everything already included I recommend: http://teslagenx.com/kits/tx-sg4tub.html?category=kits|pcb
02/09/2019 added a lower profile version. It is under 1/2" compared to 3/4". This will help reduce print time and still remains functional.
I also added a stencil for those who may want to put your circuit on a board.