A collet chuck is a type of clamping device used in machining to hold cylindrical workpieces securely. It consists of a collet, which is a sleeve with a tapered inner surface, and a chuck body that tightens the collet around the workpiece. This design allows for precise gripping and easy tool changes, making it popular in various applications, including milling and turning. Collet chucks are commonly used with CNC machines and lathes due to their ability to maintain high accuracy and repeatability. They come in various sizes and styles, accommodating different tool diameters and types, which enhances their versatility in manufacturing processes.