This is a set of seven 5C hex collets, ranging from 1/4 inch to 7/8 inch. They're made from hardened spring steel, precision-ground for accuracy, and designed to hold hexagonal stock securely in lathes with a 5C spindle taper. Perfect for automatic lathes, CNC lathes, or other machinery that uses 5C collets. The set includes the most common sizes, so you're covered for a variety of projects. They're durable, well-made, and provide a firm grip to reduce slippage and improve machining results. Easy to install and swap out as needed. A practical addition to any machinist's or hobbyist's toolkit, helping you work more efficiently and accurately. Always ensure compatibility with your specific lathe model before purchasing.