Lots of chatter about these buttons. self-locking, switch, rod, throw; and it's confusing what the different buttons do on the web. I wanted a simple button switch. I kept looking at them until finally I saw a video of someone using the same switches and confirmed my suspicion that I needed them. Click once to close the circuit, click again to close. I mean just say it. Whatever it was, they work great, solder well. A little bit more than I expected from the picture but. e. I'm currently using them for basic LED crafts, but keep thinking of other uses. I'll probably use one for my Raspberry Pi to turn it on and off, as well as various Arduino jigs.