An assortment of class 12.9 metric 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 come in M4-0.70 and M5-0.80 coarse thread sizes. Full assortments of #43095 contain sixteen (16) refills comprised of Hillman item numbers #1586 - #1592 and #43096 - #43104.