Elevator Bolts have a square neck that resists turning when a nut is tightened or removed. The large, flat head provides a greater bearing surface for soft materials. Variants included in this assortment range from 1/4"-20 to 3/8"-16 in coarse thread size. Full assortments of #4749 contain ten (10) refills comprised of Hillman item numbers #4750 - #4759.