Ferrule

/fˈɛɹuːl/

Ferrule

a metal or plastic ring or cap that fits around the end of a rod or tube to provide reinforcement, protection or to allow it to be attached to a handle

synonyms : collet

Examples

1. So I put ferrules on the end.

2. Then he hammers on the decorative metal ferrules.

3. That's in the ferrule that holds the hair.

4. But before that, there is one thing missing, and that's the ferrule.