Everbilt 5/16 in.-18 x 2-1/2 in. Rust Defender Yellow Carriage Bolt

These pro-grade carriage bolts come with Rust Defender nano-ceramic finish for a step up from galvanized bolts. They have a smooth rounded head with a square neck underneath that locks into wood when tightened. Use with a pre-drilled hole and secure with a hex nut and washer to prevent spinning. They are great fasteners for decks, play equipment, docks, fencing, and furniture.