I have no idea where I bought this tool. It was originally intended for toy train repairs. You can imagine all the tiny screws involved in that work.
The image below shows the tool in a ready to use setting or position.
The image below shows the tool gripping a small tuner mounting screw. You can easily insert a screw into a pre-drilled hole with one hand. This is not for fully tightening a screw, just for starting.