This is a nice clean, vintage 3-jaw drill chuck marked "JACOBS CHUCK HARFORD CONN. UNITED STATES OF AMERICA NO. 7B 0-3/8 CAP.". It's in good+ working condition with good jaws, adjusts smoothly, and runs true to center. It comes with a .895" straigh shank arbor attached. No rust, minor wear to finish around one of the chuck key holes, otherwise minor finish discoloration and minor finish wear. The key for the chuck is included, and is in very good condition.