An assortment of stainless steel button-head cap screws from Hillman. Cap screws carry a recessed internal socket drive to add strength. They are commonly used on machine parts, manufacturing equipment, and other mechanical applications. Variants included in this assortment range from 1/4"-20 thru 3/8"-16 in coarse thread size. Full assortments of #44004 contain sixteen (16) refills comprised of Hillman item numbers #44005 - #44020.