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 range from #10-32 thru 3/8"-24 in fine thread size. Full assortments of #45129 contain twelve (12) refills comprised of Hillman item numbers #43588, #43589, #43591, #45110 - #45112, #45119 - #45121, and #45125 - #45127.