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Expansion Nuts Assortment (#6-32 thru 3/8"-16)Hillman Item #3318
An assortment of expansion/well nuts from The Hillman Group. Expansion nuts, or well nuts, consist of a flanged neoprene bushing with a threaded nut embedded in the non-flanged end. As the bolt is screwed into the nut, the rubber on the other side of the hole expands and seals the bolt hole. Variants included in this assortment range from #6-32 to 3/8"-16 in fine & coarse thread sizes. Full assortment contains twelve (12) refills comprised of Hillman item numbers #3319 - #3330.