An assortment of button-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 range from #4-40 to #10-32 in coarse & fine thread sizes. Full assortments of #43547 contain sixteen (16) refills comprised of Hillman item numbers #3873 - #3876, #3881, #3882, and #43548 - #43557.