An assortment of fine-threaded and coarse-threaded left-hand hex nut variants from Hillman. Hex nuts are very common in general applications, especially deck and fence building. Recommended for use in conjunction with washers and bolts of similar finish to complete a secure fastener. Variants included in this assortment range from 1/4"-20 to 3/4"-16 in fine-thread & coarse-thread sizes. Full assortments of #665 contain sixteen (16) refills comprised of Hillman item numbers #666 - #681.