Plow bolts are used to mechanically connect items which need a flush surface. They are commonly used with heavy equipment such as snow plows. Use in combination with a nut of the same thread and material. Included variants come in 1/2"-13 & 5/8"-11 coarse thread sizes. Parts also range from 1-1/2" to 3" in length. Full assortments of #34418 contain eight (8) refills comprised of Hillman item numbers #34419 - #34426.