This part can be used to fix an umbrella that has one of its frames broken (see picture). Designed so that the long frame part can be pushed into the repair part without glue, and e.g. some steel wire can be used to attach the repair part to the other part of the frame.
Critical dimensions:
Will probably work with many of the bigger "golf umbrellas", but this is likely too big one for small umbrellas.
The author hasn't provided the model origin yet.