A Collet is a type of chuck that holds firmly either a workpiece or a tool. Swiss Collets are specifically made for high precision CNC manufacturing on Swiss style machines or lathes, which produce extremely small parts quickly and accurately.
A Dead Length Collet helps avoid material/part movement during the closing operation.
A Guide Bushing Collet provides guidance and stability to bar stock.
A Bar Feed Collet helps reduce vibration and keep the bar stock centerline for concentric re-gripping after being advanced by the feeder.