Some parts of a project are meant to stay right where you put them the first time. Carriage bolts are the perfect fastener for this purpose. The square underneath the cap resists turning once the bolt is set. This is especially important for decks and other projects where some parts may not be accessible at times. The round head also allows for a smooth visible finish on the outside of the project. Check out Fastener Express's selection of carriage bolts sizes and materials, and do not hesitate to contact us with any questions by using the link above.