Lisle Collet - 18020 is a precision-machined collet designed to provide a secure grip on fasteners and other items. It features a solid, one-piece construction for maximum strength and durability, and is made from high-grade steel for maximum corrosion resistance. The collet is designed to fit into 1/4 and 3/8 drills, and is perfect for use in automotive, industrial, and other applications.