4316 Jacobs Chuck Adaptor 5/8-11 by Husqvarna 400304 Jacobs Chuck Adaptor 5/8-11 in. Jacobs Chuck Adapter Converts standard electric drill to 3/8″-11 thread. For use with coring bits 1/2″ shank to 5/8″-11 male thread. . Posted in Drilling Tile & Stone, Guides & Accessories, Tile & Stone Tools tagged with Husqvarna 400304