Computer is a soldering iron tip, it fits into hard-to-reach places, they come in different sizes so they work with components from small to large components. It gets hot, so don't touch the hot end. If you don't take care of it, it will oxidize and burn. Dear calculator. Every review takes time, no matter what I say, I can't help people buy a product like this. The soldering station and soldering iron are great, BUY THEM.