It’s about 2″ long. Balls on the end have a little give so a thread can slip into the areas inside. Guesses are some kind of curtain fastener or something for dressing up? Otherwise some kind of craft or textile tool? Any ideas?

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Girlfriend found this in her craft box. She got it in a bag of things at a thrift store.

​It’s about 2″ long. Balls on the end have a little give so a thread can slip into the areas inside. Guesses are some kind of curtain fastener or something for dressing up? Otherwise some kind of craft or textile tool? Any ideas?