"ferrule : A band or cap (usually metal) placed around a shaft to reinforce it or to prevent..."

“ferrule : A band or cap (usually metal) placed around a shaft to reinforce it or to prevent splitting.
(specifically, climbing) The metal spike at the end of the shaft of an ice axe.
A band holding parts of an object together.
A bushing for securing a pipe joint.
A metal sleeve placed inside a gutter at the top.
(billiards) The plastic band attaching the tip to the cue.
(painting) The pinched metal band which holds the bristles of a paintbrush to the shaft.”

- https://en.wiktionary.org/wiki/ferrule#English

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