An assortment of stainless steel carriage bolts from Hillman. Carriage bolts are commonly used in wood connections due to the square neck beneath the round, smooth head which fits securely in the hole and prevents the head from turning. Parts in full assortment all feature 3/8"-16 coarse screw thread, and come in various lengths measuring 1" thru 4". Full assortments of #3507 contain eight (8) refills comprised of Hillman item numbers #3508 - #3515.