Stacker Arduino

What is it? It allows for a solid device where you can run two separate programs on two separate Arduino and connect at will to interact. Why did you make it? I needed a way to run a simulation on Uno and test a program I had running on another where they could be physically and solidly connected, not just by jumps. The ability to use the actual Arduino holes to solidly connect two boards into one device and then electrically connect at will. Purchase today!