Abstract: A work holder including a pusher or feed tube for an automatic machine tool, such as an automatic screw machine, with the work holder including a stock aligning and/or supporting bushing or collar member having a stock receiving opening therethrough with wedge block means coacting with the collar for selectively locking the collar in predetermined rotational position at the stock entry end of the feed tube. The locking arrangement provides for effective and rapid locking and unlocking of the collar to the feed tube, and permits ready changing or replacement of the collar member, thereby providing for rapid interchange for different sizes and/or cross sectional configurations of stock material to be fed into the feed tube.