Carriage bolts are a type of fastener commonly used in woodworking and construction. They have a smooth, rounded head and a square section just below the head, which helps prevent the bolt from turning when tightened. Carriage bolts are typically made of steel and are available in various sizes and lengths, making them versatile for different applications. These bolts are often used to secure wooden structures, such as decks and furniture, as well as in metalworking projects. To install a carriage bolt, a hole is drilled through the materials being joined, and the bolt is inserted from one side, with a nut and washer used on the opposite side to secure it in place.