An assortment of regular and long extruded U"-nut variants from Hillman. Speed nuts act as both a lock washer and nut, and are designed for quick application and removal. The extruded "U"-nut variants in this assortment come engineered to fit various USS coarse thread sizes from 1/4"-20 thru 3/8"-16. Full assortments of #58451 contain six (6) refills comprised of Hillman item numbers #58452 - #58457.