collet

詳細解釋：

col.let

n.（名詞）
A cone-shaped sleeve used for holding circular or rodlike pieces in a lathe or other machine.
套爪：用以固著車床及其它機器中圓形或棒狀物件的錐形套筒
A metal collar used in watchmaking to join one end of a balance spring to the balance staff.
油絲固著環：制表過程中將平衡發條一端與平衡軸桿相連線的金屬環
A circular flange or rim, as in a ring, into which a gem is set.
寶石座：環形法藍盤或輪圈，用以在戒指上鑲嵌寶石

來源：
French [diminutive of] col [collar]
法文 [] col的小後綴 [衣領]
from Latin collum [neck] * see k wel-
源自 拉丁語 collum [頸] *參見 k wel-