Wood screws are thread-forming screws with a smooth shank and sharp threads at a coarse pitch. They are used for directly fastening two wood surfaces together. Variants included in this assortment range from #4 to #12 in screw size and 1/2" to 1-1/2" in length. Full assortments of #46618 contain sixteen (16) refills comprised of Hillman item numbers #46619 - #46634.