This is a top-quality Jacobs Sioux 3166A14 drill chuck that is compatible with a 3/8-24 mounting size and has a capacity of 0-1/4 inches. The chuck is designed to hold drill bits securely while drilling and comes with a keyed chuck type for added convenience. The brand is Jacobs, a renowned name in the industry, and the product is new and unused.

The mounting size of the chuck is 3/8-24, and it is suitable for use in various industries such as CNC, metalworking, and manufacturing. The chuck is part of the workholding & toolholding category and is specifically designed for use in workholding and chucks. It is an excellent choice for anyone looking for a high-quality drill chuck for their drilling needs.