Socket Shoulder Screws are screws that have an unthreaded shoulder below the head to act as a fulcrum for a lever pivoted on it. Variants included in this assortment range 3/8" thru 2" in length and come in 1/4" & 5/16" diameters. Full assortments of #4711 contain thirteen (13) refills comprised of Hillman item numbers #4712 - #4724.