Thumb screws make for easy hand adjustments as they are designed to be turned with just your thumb and forefinger. Fully adjustable, they offer a wide variety of household and mechanical applications. The variants included in this Stainless Steel Thumb Screws Assortment run #8-32 thru 3/8"-16 in USS coarse thread size. Parts all feature a spade head style. Full assortments of #44930 contain twelve (12) refills comprised of Hillman item numbers #44931 - #44942.