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 range from M3-0.50 thru M6-1.00 in coarse thread size. Full assortments of #43874 contain fifteen (15) refills comprised of Hillman item numbers #43826, #43828 - #43830, #43832 - #43835, #43837, #43845 - #43847, and #43852 - #43854.