The Hillman Group 240365 1/2-Inch x 16-inch Carriage Bolt, 25-Pack UWZ8_X2JUF59

Carriage Bolts have a smooth, rounded head that has a small square section underneath. They are used in wood connections utilizing the square neck under the round head which will sit into the hole to prevent the head from turning. These carriage bolts come plated in zinc for moderate corrosion resistance.