Brand Name: Jacobs *Chuck Size: 1/2 in. *Keyless: No *Product Type: Drill Chuck *Shank Diameter: 1/2 in. *Shank Type: 3-Flat Shank *Number in Package: 1 pc. *Minimum Capacity: 1/8 in. *Usage: For use on corded and cordless drills *Maximum Capacity: 1/2 in.