High-precision thread: This drill chuck uses high-precision threads for a firm and stable connection. Long service life: Precise and meticulous workmanship ensures a long service life. The compact size won't add extra burden to your work. The 1/4-inch hex handle is convenient for installing power tools. The classic three-open-end wrench design supports a wide variety of twist drills. Application: Widely used in impact drills and electric screwdrivers, suitable for various drills, milling machines, lathes, drilling machines, and power tools. Package includes: 1 x drill chuck