Used to complete many projects, the 5/16" x 2 1/2" Carriage Bolts & Nuts are an essential accessory to builders, most commonly used to secure rail ends, brace bands, tension bands, cross-connectors, and more to form reliable connections. Carriage Bolts can be found in nearly any outdoor pipe project from chain link fences to greenhouse builds, these versatile, rust-resistant threaded bolts are easy to use and include the nuts necessary for a complete installation.