When you are building a touring car rc kit, there is always a step about building the turnbuckles. There are a lot of ways to assemble them, with a variety of existing tools on the markets.
This tool has been created to make twice faster, without arming the plastic parts.
There was an initial version with a square carbon tube, but this version is designed to use a 3mm tool as an axle, so it's cheaper.
The author hasn't provided the model origin yet.