The Galvanized hex head hex washer screw kit comes with ten hex head screws with washers attached. They come with a round-nose diameter of #13" and they have three/four" long bolts. The hexes are zinc-plated and the screws are coated with a special lacquer for enhanced corrosion-and-rust-resistance. The hexes are plated with lead and the screw's center section is coated with zinc to ensure its longevity. The hex heads are plated and coated with black oxide to further improve their rust resistance.