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 3/8" & 1/2" diameters. Full assortments of #4725 contain twelve (12) refills comprised of Hillman item numbers #4726 - #4737.