An assortment of zinc-plated coupling nut variants from The Hillman Group. Coupling nuts are long nuts used to connect pieces of threaded rod or other male-threaded fasteners. Think of them as longer hex nuts. Variants included in this assortment run 3/16" thru 3/4" in diameter and feature coarse screw thread sizes. Full assortment contains nine (9) refills comprised of Hillman item numbers #2198 - #2206.