1/2 in. x 3-1/2 in. Black Carriage Bolt Kit Includes 12 Bolts, 12 Washers, and 12 Nuts, Ceramic Black Ruspert Coated for Exterior Use - 2X Rust Resistance of Galvanized by Makers Bolt

Diameter: 1/2" | Length: 3-1/2" | Head diameter: 1.062" | Nut diameter: 1/2" | Nut wrench size: 3/4" | Washer outside diameter: 1-3/8" | Kit includes 12 carriage bolts, 12 USS thick washers, 12 hex nuts | 5-Layer ceramic black ruspert coating for superior rust resistance (2X protection compared to galvanized) | Suitable for use in ACQ treaded lumber | The flat head provides a semi-flush finish and is perfect for decks, gazebos, pergolas, and other heavy duty applications