- ferrule, collet - a metal cap or band placed on a wooden pole to prevent splitting
--1 is a kind of cap
- collet, collet chuck - a cone-shaped chuck used for holding cylindrical pieces in a lathe
--2 is a kind of chuck
- collet - a band or collar that holds an individual stone in a jewellery setting
--3 is a kind of band
--3 is a part of mounting