Crown Bolt 84270 1/4 Inch x 3 Inch Hex-Head Hot Dipped Galvanized Coarse Thread Lag Screws, 25-Count Galvanized 1/4 inch x 3 inch lag screws hex head For wood applications 1/4 inch body diameter and thread pitch 3-inch fastener length Galvanized finish with Rust-Oleum certified rust protection