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 this product. The soldering station and desoldering iron are excellent, BUY THEM.