a band or collar that holds an individual stone in a jewelry setting
a cone-shaped chuck used for holding cylindrical pieces in a lathe 同义词：collet chuck,
a metal cap or band placed on a wooden pole to prevent splitting 同义词：ferrule,
A collet () is a holding device?specifically, a subtype of chuck?that forms a [around the object to be held and exerts a strong clamping force on the object when it is tightened, usually by means of a tapered] outer collar. It may be used to hold a workpiece or a tool.
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