Whatever they were used for we can safely say it wasn't anything that directly concerned the writers of all the Roman literature that comes down to us. So upper class free men likely had no interest. Such a pricey object rules out slaves too. So you're looking at
the military, rich free women, skilled workmen or an organised faith.Which, admittedly, is a very wide group.
If it was really useful in this way, would expect similar object to have been in use throughout the glove-making world until Industrial Revolution.If they are for knitting glove fingers, being of varying sizes works. Would also speculate that there could have been lots of wooden ones around that haven't survived.
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