An assortment of chrome-plated, knurled-head, socket 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 feature a coarse 5/16"-18 thread size. Full assortments of #944239 contain twelve (12) refills comprised of Hillman item numbers #940485 - #940495 and #940497.