When you are building aircraft you need to position AN4 washers over a bolt while you are feeding the bolt between control rods, the problem is your fingers are too big to hold the washer and feed it in.
This tool holds the washer for you and is a replica of the tools you can buy for a fair bit of money and the good thing is the design can be resized to fit different sized washers.
The author hasn't provided the model origin yet.