An assortment of class 10.9 metric button-head socket 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 come in M8-1.25 and M10-1.50 coarse thread sizes. Full assortments of #43859 contain thirteen (13) refills comprised of Hillman item numbers #43860 - #43872.