An assortment of stainless steel socket-head cap screws from Hillman. Socket-head 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 feature a coarse 3/8"-16 thread size. Full assortments of #43179 contain nine (9) refills comprised of Hillman item numbers #3265 - #3270, #43180, #43181, and #43183.