Jacobs Drill Chuck 5/64-1/2 No. 33BA w/ Key
This is a nice clean, vintage 3-jaw drill chuck marked "JACOBS NO. 33BA 5/64-1/2 CAP. THD. 1/2-20". It's in very good working condition with good jaws, adjusts smoothly, appears to have never been used or used very little. It is designed to be fitted with an arbor that has a 1/2-20 at one end to fit into the threaded hole on this chuck. These arbors are still available for sale by Jacobs. The key for the chuck is included, and is in very good condition.