The Jacob's 18N Ball Bearing Super Chuck drill chuck is a high-quality tool designed for CNC, metalworking, and manufacturing applications. With a 3/4 inch mounting size and keyed chuck type, this drill chuck offers a secure and precise grip on drills ranging from 1/8 to 3/4 inches. The ball bearing design ensures smooth operation and extended lifespan, making it a reliable choice for professionals in various industries.