Reliable 50PK carriage bolt 5/16 x 2-1/2in are a fastening solution designed for wood-to-wood and wood-to-metal applications. It features a smooth, rounded head with a square neck underneath that locks into the material during tightening, preventing the bolt from turning while the nut is secured. Ideal for decks, fences, outdoor structures, furniture assembly, and general construction projects, the package contains 50 bolts per. • Includes: 50 bolts per package. • 5/16in diameter x 2-1/2in length • Square neck design grips the material to prevent spinning during installation. • Rounded low-profile head provides a clean finished appearance and reduces snagging. • Coarse threads provide strong holding power in wood and construction materials. • Designed for dependable performance in a variety of fastening applications.