An assortment of flat-head socket cap screws from Hillman. Socket 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 in this assortment come in #10-24 & 1/4"-20 coarse thread sizes. Full assortments of #43594 contain sixteen (16) refills comprised of Hillman item numbers #3893 - #3899 and #43595 - #43603.