The Jacobs No. 33BA drill chuck is a high-quality keyed drill chuck designed for CNC, metalworking, and manufacturing applications. With a capacity of 5/64-1/2 inches and a 1/2"-20 thread arbor, this chuck is durable and versatile for a variety of drilling tasks. The tapered mount ensures a secure fit on the drill spindle, providing stability and accuracy during drilling operations. The Jacobs brand is known for its reliability and precision in the field of workholding and toolholding, making this drill chuck a valuable asset for any workshop or job site.