An assortment of plain steel socket set screw variants from The Hillman Group. Socket set screws are fully-threaded headless screws with a recessed hex drive. The screw passes through a threaded hole in the outer object and is tightened against the inner object to prevent it from moving relative to the outer object. Included variants measure 1/4"-20 and 5/16"-18 in USS coarse screw thread size and run 3/16" thru 1-1/4" in length. Full assortments of #4652 contain sixteen (16) refills comprised of Hillman item numbers #4653 - #4668.