Hillman 811629 Hot Dipped Galvanized Hex Bolt, 1/2 X 6-Inch, 25-Pack This bolt is compatible with standard nuts and washers of the same thread pitch, grade, and finish or in a tapped hole with a compatible female thread. Hex Bolts feature a six-sided head, which is designed to be tightened using a wrench or drill. Hot Dipped Galvanized finish or coating. Made in China.