An assortment of class 10.9 metric flat-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 M5-0.80 and M6-1.00 coarse thread sizes. Full assortments of #43918 contain thirteen (13) refills comprised of Hillman item numbers #43919 - #43931.