Some call them telescopic, some call them collapsible, but anyway these batons are for getting some impacts on big muscles in the unfortunate event of non-compliance. This is a holder for such a baton.
Attention: This holder has a color that is a perfect fit for your UCP uniform. Some say this holder is gray, but they are wrong; the color is foliage green. If this color does not please you, it can easily be painted over.
These baton holders are unused US surplus, made by Safariland.