The Jacobs 10mm Hand-Tite 30354 is the ideal drill chuck for any job, whether you’re a professional or serious DIYer. Its positive locking mechanism ensures superior bit holding and prevents loosening during hammer applications or other high-vibration tasks. With a chuck size of 3/8 in. and a capacity of 3-8 in., it’s perfect for a variety of uses and rooms to grow. Get reliable results with Jacobs.