USE ONLY FOR BBF1 and BBF1C that feature the wire glass dish retaining ring. 

All other barrier guard feeders use the longer screw #30055.  SEE IMAGE BELOW

Replacement Phillips Truss Head Screw (1/4-20 x 1/2"). Secures Glass Dish Support Ring. 

For BBF1 and BBF1C Starling Proof Feeders.

Call us at 1-800-342-3782 if you have any questions.