An assortment of zinc-plated, fine-thread, coupling nuts 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 range from #10-32 to 3/4"-16 in fine thread size. Full assortments of #4371 contain eight (8) refills comprised of Hillman item numbers #4372 - #4379.