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 M3-0.50 and M4-0.70 coarse thread sizes. Full assortments of #43825 contain sixteen (16) refills comprised of Hillman item numbers #43826 - #43841.