Brass Bulkheads with Bite-Style Barbs. 10-32 mounting Threads for 1/16 inch, .078, and 3/32 inch. 1/4-28 mounting Thread with 1/16 inch thru hole to 5/32 inch Barb. 5/16-24 mounting Thread with 1/16 inch thru hole to 3/16 inch Barb. 3/8-24 mounting Thread with 1/16 inch thru-hole to 3/8 inch Barb. Mixed sizes are available for Straight and Elbow models.