Crown Bolt 06380 5/16 Inch-18 x 6 Inch Coarse Thread Hot Dipped Galvanized Steel Carriage Bolts, 25-Count Galvanized 5/16 inch-18 x 6 inch carriage bolts For general applications 5/16 inch-18 body diameter and thread pitch 6-inch fastener length Galvanized finish with Rust-Oleum certified rust protection