Good link IronSpike. It says that these are most likely horse harness rings.
A complex harness can have more than 20 rings, and someone finding a cluster of 20 bronze rings buried together with nothing else in the context, could easily conclude he had found a hoard of money items. But that conclusion would be incorrect.
Considering the role Horses and their harnesses played in the ancient and medieval world, one can only imagine how many millions of harness rings (or groups of rings) ended up buried in the ground. Consider that harnesses are sometiimes still being made this way, and have been for at least 3000 years, it is not generally possible to define the date or culture of a simple ring outside of it's burial context (or even in that context if all there is, is a cluster of rings). This is why the common practice of automatically calling them either Celtic, or ring money, is without merit.